Help explain this pH rise!?!
I decided last night that it might be a good idea to test my tap water parameters - just to see what's coming out (and ultimately, what's going into my tank). I did three consecutive pH tests, first I tested the tap water, then the "treated" water, and then the tank water (one day after 50% water change).
The treated water contains Aquaplus tap water conditioner (to remove chlorine, chloramine and heavy metals) and aquarium salts - it had been sitting out for 24 hours.
The tank is supposed to be blackwater - I use a blackwater extract, peat filter and driftwood.
The problem seems to be with either the Aquaplus or the salt (or both!). I have only ever tested the tank water and it's consistently been at 7.5, even with the blackwater treatments & pH Down which I used during cycling.
I've been using Aquarium Pharmaceuticals test kits. I would like to lower my pH to at least 7.0, since all of the fish I keep (rams, rasboras, corys) are "low" pH fish. If it's of any consequence, I do not use CO2 but instead dose with excel every other day.