The ph in my tank was 7.2 out of the filter but has risen to 7.5. Everything else is fine, no nitrite, no ammonia, gh is 5 degrees. We have one small bristlenose cat in the tank at the moment and everything has stayed the same for a week. So here’s the question do we try to lower the ph or do we just go ahead and add some more fish. Oh it is a very small tank so we can only add about 10 tetras size wise.