Thanks Mani
Was more concerned that if there should be a prob with pump that i didnt want it to burn out cos they can scorch airline & didnt want fish hurt during night, i turned it off last night & all was fine this morning put back on then & no syphen from airline, mind u my filter causes movement with water in any case, now ive ended up with a few more fish i may have to leave it on overnight - mind u my little becks loves floating up off the bubbles like a bungie spring LOL!!