I have found that ceramic rings work really well. They are easier to maintain than bioballs in my experience.Right now I have the following in my 24"x12"x15" saltwater tank:
4 common mollies
Freshwater sand and crushed coral as substrate
Hob filter with sponges
I have a canister filter and planned to add biological filter media inside them as I don't have live rock, don't have time to make them and don't wanna buy a sump.
I have Bio ball, ceramic rings and lava stone.
What are the best biological media for a sw tank?
@Colin_T @Chad