filter/skimmer?

i have a 10g nano at the moment, after i move, in a few weeks, i am upping it to a 20G. im using 2 hang-on aquaclears... just small ones, one for a little fuge, the other for the filter. aprox. 15lbs LR. no skimmer though. everything seems to be doing pretty good so far.

any thouights on what i should use with my 20G though? obviously im gonna need something a little better then what i have now....

any suggestions would be appreciated.

oh yeah, almost forgot.... good or bad? i noticed a few days ago, little transparent worms on my glass.... some 1/4" long, others 3". today... i noticed quite a bit more.... :-S