View Full Version : Chemistry Questions


kday25
12-16-2009, 3:57 PM
Hello Reefers!

I was doing some parameter testing last night and found a few things that are off. Can y'all give any interpretations or suggestions on how to bring things in check?

By the way, I dose Aquavitro Calcification and Fuel about every three weeks. I don't use the recommended dosing because i am afraid of overdosing. I do a 15% water change every other week. I know there are more Aquavitro products that can help my situation, but wanted to hear some thoughts from the experts/experienced reefers.

SG - 1.023 (refractometer has not been calibrated with that...stuff, i just use tap water and adjust it to zero...is that a problem)
pH - 8.3 (Elos)
Alk - 5.1 (Salifert)
Ca - 390 (Salifert)
Mg - 950 (Elos)
Phosphates - 0 (API)
Nitrates - 0 (API)

I would like to get my SG back up to 1.025 or 1.026
Also, I remember from previous testing (months ago) that my Alk was a lot higher...in the 8-10 range. But now it has plummeted.
And then my Magnesium.....what would you suggest to bring it up?

Any feedback will be great!

weaglereefer
12-16-2009, 4:00 PM
You just missed the Bulk Reef Supply group buy. For Mg, 10:1 ratio of Magnesium Chloride: Magnesium Sulfate (epsom salt). You could drip limewater at night to raise the alk and calcium back up.

A few water changes with good quality salt may be all that is needed to get parameters back in check, though.

johnr2604
12-16-2009, 4:06 PM
Like above get some supplements from BRS and follow the directions. You need to calibrate your refractometer with distilled water or calibration fluid.

kday25
12-16-2009, 5:55 PM
A few water changes with good quality salt may be all that is needed to get parameters back in check, though.

Im gonna start here. From reading this forum for the past year, Ive realized a good water change is sometimes the best solution. Im thinking of increasing the water change amount to 20%, and maybe changing it more often.

I visited BRS.com, a cool site that Ill spend some time on. Mad at myself for not jumpin on that power buy....i slacked a little on the parameter testing.

Thanks for the reply

kday25
12-16-2009, 5:58 PM
You need to calibrate your refractometer with distilled water or calibration fluid.

Thats the next thing Ill buy. After I get the calibration fluid, will I ever need to mess with the little screw again? How often does it need to be calibrated?

Hackman72
12-16-2009, 6:04 PM
Thats the next thing Ill buy. After I get the calibration fluid, will I ever need to mess with the little screw again? How often does it need to be calibrated?

You'll need to check it periodically anyway. I usually recheck mine on a whim every few months or so and have only adjusted it a time or two. You might also get a q-tip with some distilled white vinegar on it and rub the prizm to get any build up off (you may not be able to see it). That will also give you a false reading. Then rinse it well with ro/di water and then calibrate it.

mysterybox
12-16-2009, 6:18 PM
read this over:

http://www.reefkeeping.com/issues/2004-05/rhf/index.php


http://web.archive.org/web/20021127040526/http://www.advancedaquarist.com/issues/nov2002/chem.htm



http://www.advancedaquarist.com/issues/feb2003/chem.htm



calculator:


http://home.comcast.net/~jdieck1/chem_calc3.html



I would ditch the fuel.

purpleGORILLA
12-16-2009, 6:28 PM
Might want to calibrate your pH meter also. I can't imagine your pH is 8.3 with all the Alk, Calcium and Mag being so low.

weaglereefer
12-16-2009, 6:29 PM
Might want to calibrate your pH meter also. I can't imagine your pH is 8.3 with all the Alk, Calcium and Mag being so low.

+1

I didn't even catch that, good eye.

kday25
12-16-2009, 6:53 PM
I used an Elos pH test kit. That 8.3 could be high. The color strip can be deceiving. I did stare at it for a minute trying to distinguish whether it was 8.1 or 8.3. Is there a more accurate pH test? Or is a pH probe a better choice?

Thanks for the input guys, Im reading the Holmes-Farley stuff now....gonna start dosing this weekend.

mysterybox
12-16-2009, 7:08 PM
I used an Elos pH test kit. That 8.3 could be high. The color strip can be deceiving. I did stare at it for a minute trying to distinguish whether it was 8.1 or 8.3. Is there a more accurate pH test? Or is a pH probe a better choice?

Thanks for the input guys, Im reading the Holmes-Farley stuff now....gonna start dosing this weekend.


strips suck. meter is best, elos ph kit is very good.

Amici
12-16-2009, 7:09 PM
strips suck. meter is best, elos ph kit is very good.

You need to go get your glasses Ralph lol, hes using an Elos and I think is calling the strip the color card.

mysterybox
12-16-2009, 7:15 PM
You need to go get your glasses Ralph lol, hes using an Elos and I think is calling the strip the color card.


gotcha!

kday25
12-16-2009, 7:22 PM
Thanks Charlie, color card is correct. I did the test twice, as its pretty simple. Came up with 8.3 both times. I was kinda skeptical, but it was def darker than the corresponding 8.1 color.
Are there any pH probe meters for less than $100? Or are they priced high for a reason (i.e. they work)?

Im guessing this is the benefit of the Aqua Controllers....

Skriz
12-16-2009, 7:42 PM
I wouldn't dose anything to pull the numbers back into alignment. I'd reccomend a large water change (30%+) to return the tank to an aquillibrium. Then go from there.

You can get ph pens for pretty cheap (under $100). They're well worth it & better than a test kit. If you don't already have a controller, I'd look at the aquacontroller jr. You can get one with a ph probe & dc8 for under $300. This will monitor your ph accurately as well as controll the aquarium. You'll love it & wonder how you ever made it without one!

kday25
12-16-2009, 8:01 PM
The AC Jr will be put on the list of potentials....looks like its well worth it. So many decisions....love this hobby.

Def a water change first, though. Thanks All:D

weaglereefer
12-16-2009, 8:07 PM
You could get a Reefkeeper Lite, SL2, and pH probe, and you should still come out under $200. Throw in a temp probe and salinity probe for another $70 or so and you can get full control of the tank, including the ability to turn off lighting when the temp is too high, control heaters, fans, etc. It's one of the best values in controllers.

kday25
12-16-2009, 8:41 PM
You could get a Reefkeeper Lite, SL2, and pH probe, and you should still come out under $200. Throw in a temp probe and salinity probe for another $70 or so and you can get full control of the tank, including the ability to turn off lighting when the temp is too high, control heaters, fans, etc. It's one of the best values in controllers.

This is great. I will look into those. BTW, I checked out your build thread. Your sump/fuge area looks sweet....very well planned and executed. Got any updated pics?

johnr2604
12-16-2009, 9:35 PM
You could get a Reefkeeper Lite, SL2, and pH probe, and you should still come out under $200. Throw in a temp probe and salinity probe for another $70 or so and you can get full control of the tank, including the ability to turn off lighting when the temp is too high, control heaters, fans, etc. It's one of the best values in controllers.You will also need another DC4 if you wan't to run a reactor otherwise you will be short on controllable plugs.

weaglereefer
12-16-2009, 9:42 PM
Yes, that's true, but I wasn't looking at it in a sense of a reactor, mainly just to monitor pH and control temp, and since the original poster was looking for a pH monitor, this is a very good value.

Skriz
12-16-2009, 9:50 PM
You could get a Reefkeeper Lite, SL2, and pH probe, and you should still come out under $200. Throw in a temp probe and salinity probe for another $70 or so and you can get full control of the tank, including the ability to turn off lighting when the temp is too high, control heaters, fans, etc. It's one of the best values in controllers.


The RKL is not compatible with the SL2, so you'll have to get an SL1. You'll also have to add the ph probe and another PC4. When you do this, you're at $295.

The ACJR with a DC8, ph probe and temp probe is $257. This is the best value in controllers.

The RKL $99 base price is a gimick that'll naill you in the end.

weaglereefer
12-16-2009, 9:54 PM
Per Digital Aquatics, with Firmware version 1.03, ALL modules except the RKM-Net, are compatible with the RKL.

Skriz
12-16-2009, 9:57 PM
Per Digital Aquatics, with Firmware version 1.03, ALL modules except the RKM-Net, are compatible with the RKL.

Cool! I didn't know about the updated firmware. Then I guess that takes the total price of the RKL to $310 :)

weaglereefer
12-16-2009, 10:02 PM
Well apparently the RKL is compatible with the NET module too!

johnr2604
12-16-2009, 10:10 PM
The RKL is not compatible with the SL2, so you'll have to get an SL1. You'll also have to add the ph probe and another PC4. When you do this, you're at $295.

The ACJR with a DC8, ph probe and temp probe is $257. This is the best value in controllers.

The RKL $99 base price is a gimick that'll naill you in the end.I guess it really depends on what your plans are. I'm ordering a lite because I only need light, temp and pump controls on the system it will run. I have no plans on using reactors and could care less what my PH is unless I'm noticing a problem, so its fine for me ( although short on plugs). I totally agree though that if you want a reactor or have more expectations from your controller then the ACjr would be the best value.

cr500_af
12-17-2009, 1:56 AM
Also, some of us are on a budget and it is easier to buy an RKL and then add some features a little later so it isn't as big of a bill all at once. I have been totally happy with my RKL so far, just adding one extra PC4. Next is the pH probe and SL1 or SL2.

Skriz
12-17-2009, 8:43 AM
I guess it really depends on what your plans are. I'm ordering a lite because I only need light, temp and pump controls on the system it will run. I have no plans on using reactors and could care less what my PH is unless I'm noticing a problem, so its fine for me ( although short on plugs). I totally agree though that if you want a reactor or have more expectations from your controller then the ACjr would be the best value.

Agreed. The RKL is the best for smaller or lower requirement systems. The unit is cooler than the acjr too.

SnowManSnow
12-17-2009, 4:10 PM
Well apparently the RKL is compatible with the NET module too!

works with net in january if i remember correctly :) will be a DEFINITE BUY!

how about a group buy on the NET module! :)

kday25
12-20-2009, 2:13 PM
I did a 15 gallon water change yesterday (30%). Made the water Thursday so it had time to brew a little. Here are the results of the testing I did this morning.

pH 7.9
KH 5.9-6.0 dKH
Ca 400-410 ppm
Mg 1000-1050

SG 1.024

Im happy with the results, and plan to do another 25-30% next weekend. I guess I added some stony corals and slacked on the water changes a bit. i will definitely be more active from now on.

Do you think I should start a dosing regiment soon? I was thinking Kent CB 2 part.

Thanks for the reef controller discussion, that will prob be something i save for in the future.

mysterybox
12-20-2009, 3:15 PM
Amy two part will work, brs is inexpensive.