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Re: Do i need a Bubbler
With a powerhead, that should be more then enough aeration for your tank. In fact in most tanks it's not really necessary to have a bubbler, since most of our filters will do all the aeration our tanks need. The bubbler's are usually for our enjoyment (and some fish really enjoy playing with them too). Yes there are some tanks, like a heavily planted tank for example, that will need some extra aeration. Also some people use them in combination with their filtration (i.e. under gravel filtration) so in some cases it can be needed, but I'm just talking about the typical tank environment.
As to the film on top of your water, that could be several things and it actually could be caused by too much water movement. Do you use any chemicals that have a "Slime-Coat Enhancement" in it? If so then that combined with a lot of splashing in your tank can cause a lot of bubbles to accumulate in your tank. The slime coat actually lets these bubbles exist longer because their 'skin' is now thicker then just being a bubble in water. In other cases this can be a form of an algae bloom in your tank. If you take your net, can you skim it off the top or does it just break apart at contact with anything? Also does it have any color to it (green, white, etc.)? It could be a number of things really, and without more info would be hard to let you know exactly what is the cause. Because it certainly could also be caused by not enough surface movement if you have your powerhead output under the surface of the water and not skimming across the top.
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