Coral Color w/o fish

[BigKid4788]

I've recently lost a battle with Ich. I lost about a dozen fish leaving me with a couple chromis and a six line wrasse. I was thinking of catching those three fish and letting my tank run w/o fish for a couple months to ensure all the ich dies off.
My question is since corals feed off of fish pooh (after it breaks down), how can I keep my corals colored up? I'm currently running the Triton method and would prefer not to add too many other things if at all possible.

Thanks for your input!

 

[4FordFamily]

Any decomposing organics will work, some use fish food, but honestly your inverts and coral will do the trick minimally I would figure