#ed_op#DIV#ed_cl#Hi guys, I'm just getting started. I have a 250ltr corner unit don't know what that is in gal. I'm using a canister filter 1500ltr /h. Oh salt water is the go here. I'm keen to know what substrate the canister filter shoulod have for a marine setup?#ed_op#/DIV#ed_cl##ed_op#DIV#ed_cl##ed_op#/DIV#ed_cl#