quick nugget of advice: Lets figure out what is going on before buying any more fish, no need to take more lives.
I don't think it is water, as you have several coral, an anemone, and some sort of red starfish, that all seem to be doing well. The heater could have caused some deaths, but not with clowns. And I really doubt it was the pump, I have extremly low flow in my tanks and it has never once caused a problem.
Agree with sharkbait, we need to know how the fish died, what they looked like upon death, etc.
I don't think it is water, as you have several coral, an anemone, and some sort of red starfish, that all seem to be doing well. The heater could have caused some deaths, but not with clowns. And I really doubt it was the pump, I have extremly low flow in my tanks and it has never once caused a problem.
Agree with sharkbait, we need to know how the fish died, what they looked like upon death, etc.