This has to do with equipment, but also water parameters I guess, so here goes:
I got out of Marine, and am now getting into fresh, and a soon-to-be planted tank. I purchased an Oceanic 30 gal cube which I drilled the back of. I did this so that I would have no stacks, or have return tubes hanging off the edges (keeping it clean).
I've drilled a return hole with bulkhead at the centre near the top , and two returns with bulkheads left and right of that. Two returns means a split tube, because my filter might churn things up.
Since it's side-drilled, I was planning on building a small surface skimmer box, just like marine for more surface contact and gas exchange. BUT I was wondering if the Eheim 2227 I'm going to use with it would give me enough oxygenation for fish (and plants) as it has/needs its air intake tube to perform its wet-dry functions. If that was the case I wouldn't build the skimmer box, and would just put a small foam prefilter in the drainage bulkhead.
And thus, I leave this question to you pros, and eagerly await your answers, thanking you in advance.
PS If anybody posts suggesting putting a bended piece on the return tubes and pointing upwards, I thought of that, but want as little hardware in the tank as possible.