i recently done some changes to my tank i.e took off hood fitted luminaire etc. since i have done it i conected my skimmer back on and it now it flooding my tank with very tiny air bubbles and i cant seem to alter it. if i loose more in air it does get better but not go away the only trouble is then the pipe that goes from the tank which is a u bend is only half getting full with water unless i turn air down which then increases bubbles. will this do any harm or is this normal after skimmer been turned off for few hours and this was not happening before and was collecting foam fine. it is a seaclone skimmer which i know are crap but it was working ok before i dissconected and reconected.