I run a biowheel 330 and a biowheel emporer 280 on my 38. That is my filtration. They work fine. I'd throw them on for now. Just to get get things started anyways. I would use the filters with media unless you plan on a ton of rock. In that case all you need is a powerhead.
I have media in place with the biowheels and have 0 nitrates.
38 gal SW
, 40lbs base rock, 5lbs live, emporer 280, bio-wheel 330,tronic heater, 2 O. clowns, 1 firefish.
29 gal FW
, boring...soon to be salt I think.
10 gal SW
, 20lbs LS
, 20lbs base rock, 1 unhappy domino damsel (he was in the 38...switched the percs and the damesel recently).