High pH

[Blazin__]

just went up to 8.6 today... it seems to be climbing slowly.... what would cause this?? its a 29 gal overflow setup with fuge and is about 2 years old all params are ok. ammonia nitrate and nitrite all 0 calcium is 400 i dont have a proper alk test kit but the one i have says its high.

 

[ChrisRD]

It's a bit on the high side, but shouldn't be a problem. If it gets much higher you may notice some of your corals showing their unhappiness (by not expanding fully, etc.).

Make sure you've got good aeration in the tank (ie. good surface aggitation and good, strong circulation). This will help stabilize pH levels. A protein skimmer is very helpful in this regard (aeration).

As a last resort, if pH is extremely high you can use some distilled white vinegar or carbonated soda water to reduce your system pH, but that's not a long term solution. In your case, your pH is not high enough to be going that route (IMO).

HTH