I've had my 65 gallon up and running for about 2 months now. Everything cycled great and the fish were doing well until about 2 weeks ago when my fish started dying. Everything is normal except for my pH. It is super super high. Like 8.8. I took a sample into the lfs and they came back with the same thing. I use conditioned tap water in the tank, and all of my tanks without problem. The lfs tried to tell me that is because I'm using tap water that it's so high and the pH of the tap in my area is that high so I need to buy RO water from them. I checked the pH of the tap when I got home and it was only 7.2. What could be in my tank that's causing this?
Stuff in my tank:
Substrate pool filter sand
3 large pieces of drift wood
Large rocks from when I had a salt tank (no idea what type of rocks they are)
Several live plants
Could it be the rocks?
Stuff in my tank:
Substrate pool filter sand
3 large pieces of drift wood
Large rocks from when I had a salt tank (no idea what type of rocks they are)
Several live plants
Could it be the rocks?