i have three powerheads one maxi jet about300gph and two others dont remeber what kind one 600 one 300 gph the problem is they put little bubbles in the water not always about every min. or so one of them will shoot a burst of little bubbles witch makes my water luck cloudy.before i got any of them water was cristle clear dont know what to do. any help. PS they came with little hoses to control (i guess) air bubbles i didnt use them i just put on the caps instead is that the prob. :?