carib

I brought something called Desert Bone rock. It is apparently is calcium carbonate. I think that means it is either limestone or coral skeleton. Would this be good for a Malawi tank? Product link...

I can't find any info online regarding the actual content of carib sea cichlid sand, specifically the sahara mix. What specific water chemistry does it create/maintain? I'm thinking about getting some featherfins that have been bred/raised in a tank with that substrate. I simply use coral to...