Hello: I have a mag 5 with a SQWD and straight nozzles on the loc-lines and it is really strong for my 20 High. I need flaired nozzles to settle it down some. I don't mean to steal this thread but I started out with everything OK, then as my tank started to cycle I started to get a few microbubbles. when the rock cured and the phosphates and nitrates were just about zero the bubbles were almost gone as well. I ordered a refugium critter kit and live sand (really smelly stuff) and now my nitrates are back up to 5 and my phosphates are upto .25, my microbubbles has returned again. Is the Mag pump prone to poor water? Anybody else with this problem, which will go away again.....I hope!