I've used crushed coral and sand. If the intending to use sand get numerous snails to help keep it clear, you don't want to be vacuuming it or stirring it up,it make a multitude!! From discus fish to Oscars together with other big cichlids, sustaining a tank comprehensive of large https://donovangaobn.bloggip.com/37497316/fascination-about-aquarium-setup-tips