if you had a 39 gallon (US) tank with yoyos, kuhlis, harlequin rasboras and a lone female dwarf gourami, who may well move to another tank soon, what filter would you choose, bearing in mind (a) not too noisy and (b) not ludicrously expensive and (c) unlikely to pump the contents of the tank all over the floor in an emergency?
any advice appreciated; I think I'm getting beyond internals now, though I did like the fluval4+ - and I was wondering about a powerhead with a box for media. Biological filtration never seems to be an issue in my tanks

- it's the flow I'm wondering about.
I'm a novice at filters.
I'd like to be told!