if you get a fairly shallow tank (18" or something like that, maybe a 48 gal or 54 gal) you could just throw another 175w MH over it and that would be that. the bargain finder has a few 175w setups in it right now, i bet you could haggle for a good price. r_wellwood has that berlin classic for sale, that would probably be a good skimmer. get yourself some pieces of glass and turn your 20 gal into a sump/fuge. would be a rather small fuge (maybe 5 gallons), but it would get the job done i think.  my sump/fuge tank is a 50 gal and in the end the fuge only takes up 17 gal.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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