Tylers ~30 gal system build.

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So i decided to order a matted filefish for my tank that has become overrun with them wonderful brown pests. I figure any corals he gets a taste for, well i guess ill have to set up a frag tank, darn... Anywho the lfs finally got one in and its probably just over 2". Anyone here think its a mistake in a 20g tank? I have a good amount of flow and kept the rock down in the DT for more swimming room. Im just a little concerned on this move thats all. One last thought before pulling the trigger, i dont like impulse buys, ive gotten burned too much. Anyone have any opinion on that? (the idea is if hes successful with the the pest removal i can do a new FTS)