Think about a protein skimmer! These filtration units can be added to almost any saltwater aquarium and can increase the bio-load in your tank.
When you see dirty looking foam on a beach, you can use the same principal to aquariums! The skimmer injects fine air bubbles into its chamber and when the bubbles come into contact with proteins (leftover food and everything else that comes from a fish), they flow into a cup where they're collected.
This leaves cleaner water and can reduce the amount of water changes needed. Talk to an Into The Blue team member about what model of skimmer is best for your aquarium!!