First- the 303 has one chamber sponge/felt pad, one with chemi pure and one with some bio balls. I may change to more sponge and filter floss one day though.
Second- the plate coral I got when I bought the rock/corals from the guy that it before me (all that was in his 65). I traded the mother colony awhile back to a friend- I had pulled probably half a dozen of those guys off before I got rid of it, not including the ones I have and last I saw it in his tank it still had maybe another dozen on it, they just keep popping up!