I'm going to upgrade my filter to an XP3. Unlike the Fluval, it seems I won't be able to adjust it the way I would like. I don't want to use the spray bar as I don't believe I'll be able to get good circulation in the tank (75g).
Using the "power head nozzle" that comes with the XP3 as shown in the photo, it seems like I'll end up putting the power head below the surface. With the Fluval, I have the output in the far right corner, an inch below the surface with the duckbill facing the front left corner, at a slight upward angle, which causes a little surface agitation and has been working well. I'm not sure if that will be possible with the XP3 as it seems it has to be facing straight ahead, not angled up or down or left or right. Unless I don't use the suction cup, but with the formed piece at the top, that may be a necessity.
My question is this... With a 75g, moderate/highly planted tank, C02, XP3, no airstone and a fully stocked tank, will my fish have enough oxygen in the water?
I understand that with surface agitation, you lose some C02, that's fine, I'm not worried about that... just trying to figure out if I need to keep the powerhead of the XP3 just below the surface to agitate the surface water to introduce oxygen into the water or if I can leave 6 inches down or so, which would provide better circulation in the tank. I've read some posts where they say the filter alone provides enough oxygen in the water for a stocked tank... I don't understand that logic, so I'm asking here to be certain.