I have lost 6 of the 8 plattys I got two months ago. I have very hard water with a high
pH 8+, which I think is causing the problem. None of the rasboras in the tank or the platty fry which are a few weeks old have died, just the adult plattys. My
LFS owners says the hardness is not a problem, but I have my doubts, I also lost all 8 mollies I bough last winter in a matter of a couple months also. I have tried ampicilllin from the store, which now the owner says doesnt work

He wants to sell me a sulfa based drug, but I don't believe infection to be the problem due to not loosing anything but the adult plattys. Any help would be appreciated, it is very depressing to lose my fish.
