PDA

View Full Version : ca alk and ph problems - help!!!!


jligon
08/04/2007, 10:42 PM
There is something I must be doing wrong because I seem to have mid 400's on ca, alk around 8but the ph can be 8.0! I don't understand what I am doing wrong.

Another symptom: I will slowly add alk in the form of naco3 and the ph will slowly go up to 8.3 (all day process). I also add cacl and it remains stable in the mid 400's. When I stop adding the alk, the ph will drop from 8.3 to 8.17 in one hour and the alk will drop from 11 - 12 to 7 - 8 in the same period (where did it go?).

It is a 50 gal tank with just a few fish and 4-5 frags. I have become frustrated as I find I must baby this thing many hours every day and cannot leave for a vacation without the ph being 7.8 -7.9 when I get back. I have never been able to maintain ph above 8.2 in the 2.5 years I have been trying. Buffers are good, nitrates are low to zero, mg is in the mid-1200's. Use kalk as well but to no avail.

Another symptom; the ph does not go up during the day, but at best it may stay flat to whatever ph was there when lights came on.

I dearly love the hobby but am very frustrated because the coral frags neither grow or die, they just languish because I do not have the chemistry just right.

Are there any reef chemistry experts that can help with what is the issue and some detailed techniques?/

Jligon

bertoni
08/04/2007, 11:32 PM
<img src="/images/welcome.gif" width="500" height="62"><br><b><i><big><big>To Reef Central</b></i></big></big>

Low pH is a common issue. I would start by doublechecking the measurement, since test problems are very common. After that, low pH is caused by high CO2 levels. Dosing kalk can increase pH by consuming CO2 from the water, converting it into carbonate, but aeration will bring the pH back down over time. Fresher air is the usual solution, although a lighted macroalga area can help a lot.

This article goes into details:

http://www.reefkeeping.com/issues/2004-09/rhf/index.php

jligon
08/13/2007, 04:02 PM
Great article and I will investigate all the possibilities

bertoni
08/13/2007, 04:17 PM
You're welcome! Good luck!