Is this OK!?

[p1ngu]

Is cichlid gravel consisting of shell grit, harmful to your fish? americans and africans?

 

[jimbooo]

depends what fish your stocking the tank with. i dont want to assume your putting cichlids in there. if you are then it's fine. if not then dont use it, it alters the PH to suit cichlids. most other fish would not appreciate it.

 

[yvez9]

that kind of substrate will release calcium upon other things in your water, raiding the hardness and the pH

african cichlids will dig it, but americans might not

as for it being harmful, it could become harmful to a certain extent...