So, I am looking to create the ultimate 72G Malawian cichlid tank and I am debating about my substrate. Originally I planned on using just a natural gravel. Our water in my area is pretty hard but, never the less, I want to buffer a nice hard cichlid friendly situation. I am not a big fan of chemical additives and would like to avoid those.
I have heard of using crushed coral but I am not sure how to implement it (I have a completely canister based filter system along with a Phosban Reactor, and a small protein skimmer hanging on the back).
Another option is this product called Eco-Complete African Cichlid Substrate, see here:
What do you all think? I am going for pH stability and the optimal enviorment.