The "must-haves" for every coral keeper?

[mandyplo]

Originally Posted by reefwars

gfo is one id never do corals without....if you want to keep coral phosphates are not your friend

Whats a gfo? And also what is an ro?

What are the food types/brands that everyone uses that work well for them?

And what do you guys do to keep your corals colorful and vibrant?