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You'd think that, but in my experience, tanks can run at pH's of around 5 with no great trouble. I used to breed angels in similar conditions with foam internals or undergravel filters. Stocking density wasn't too bad and water changes were regular weekly and good sized, but at the time I never...

I went for a fine scattering. I've had a few balls escape with digging cichlids being in the tank. They pick at them occasionally, but don't eat them. About 1 dessert spoon per square foot of tank base for me. First thing in, then the substrates.

I do it, haven't had any trouble from it.