Low PH problem
We are having some Ph problems with our 90 gal salt water set up. It seems to only occur a few weeks after we do a 20% water change. We have had to add PH UP several times already, but we dont understand why the buffers we have in place are not doing their jobs. We are also not sure if the new RainSoft water filtration system (for the house) has any effect. The saline level has been fine and we were told that the "Instant Ocean" we add should buffer the PH, but it is not. The PH has gotten as low as 7.2, killing our fish.
When we add new fresh water during the water change, we add the instant ocean to it, PH was checked to be normal, so what is causing it to go down so low?
We have plenty of crushed coral on the bottom of the tank, 5-6 Live Rock.
It is a fish only tank.
Sump pump set up
Proten skimmer installed
Tests (nitrate, saline, ammonia are fine)
Last edited by dutchie; 11-02-2009 at 08:43 PM.