Hi I have a filter with adjustable head, does a full 360 circle but unable to move up and down and I currently have it just under the surface for cycling, once fish are in is there anyway I can stop all the bubbles? And noise of water splashing around? I heard that you can put it facing backwards so its hitting the tank wall but this doesn't sound like it would oxygenate the tank ? Someone help me please I get frustrated with myself for not knowing such simple things!