I believe (someone please correct me if wrong as i am still a little new) that if you want to avoid the small air bubbles by connecting the tube you could point one or both of the PH
's to break the water surface and that would introduce enough o2
into the tank. I am not sure if combined flow rate of the pumps have anything to do with o2
introduction but from my reading your total GPH
of the PH
's should be at least 10x your tank size (I think maybe as high as 20x). I am sure someone will tell you different if I am wrong). Hope this helps.
65 gal reef
2 PC's 192W each , 20 gal sump/fuge
4 false clowns, 2 firefish, cardinal, midas blennie, toadstool, zoos, shrooms, trumpet coral, torch, pagoda, frogspawn, poylps, red open brain, devils hand, hermits, snails, 3 cleaner shrimp, coral banded and a emerald crab.