Only from the outflows of my HOB's, and the surface movement from the canisters. They generally create PLENTY of oxygenation unless you're HEAVILY overstocked.What do you guys use to keep oxygen up in your tanks? Can anybody recommend a SUPER quiet airpump from experience? Or any better ideas?
for 55's I recommend 2 hob's (300GPH) plus small canister@250+gph
for 75's I recommend 2 hob's (300GPH) plus mid/large canister@400+gph
Larger 125+ gallons(125 largest I've personally ever had), multiple canisters (2+) and at least 2 HOB's where possible(if one fits). If HOB wont fit, raise up your output tube accordingly to agitate the surface.
That said, these are my personal habit's, YMMV