skimmy, in your opinion, do you think my euro 100 is under sized for my tank? tank is a 90 tall with around 30 gal sump/fuge
if it was me, i would ditch the fuge and do a pellet rx, bigger skimmer, GAC rx, and 100 micron mesh sock on sump imput.
or just keep your ball of chaeto(if it can live after all that other filtration)
trapped in a corner with some egg crate and gutter guard, and a little light.
as far as skimmers, for 120g total, i'd say the aquamaxx EM200 drae mentioned would be good, or the rlss 6 for $50 more and 200plh of air injection more would be even better.
but the main thing i notice is it seems you got no carbon on your set up, and i think a good carbon will do almost as good of a job as a good skimmer can do, so the obvious answer is to have both. even if its passively run in a media bag in front of a powerhead in your sump, but better in a GAC rx.
also, a 20 long makes a great sump and is dirt cheap, if you just wanna start fresh.
or even just moving your chaeto to the first chamber which looks like a wet dry box... that small bunch of chaeto will fit there. then you got room to play.