if your PH doesn't drop, or stay down after it has been buffered, then you could have really hard water. It won't affect the fish but it would stop you being able to lower the PH.
the only other thing then is food. What sort of food do you feed them and were the angelfish fed the same thing the swordtail and platy were fed before they died?
the only other thing then is food. What sort of food do you feed them and were the angelfish fed the same thing the swordtail and platy were fed before they died?
