I am running a 30 gallon and instead of using a skimmer I got one of those
attachments for my hang on back filter which sucks water from the surface
instead of submersed. This along with another hang on back filter keeps the
tank very clear and clean. I went this way because I converted fresh water
tanks to salt and couldn't afford a big fancy skimmer and didn't want to buy
a cheap one that will be replaced at some point anyways. I will however buy
one eventually so I can carry a larger fish load. Right now with the LR,
corals, clean-up crew and three fish my set up works great.