Dave,
You shouldn't have any more of a possibility for scum on the water by using
an internal filter than you do by using an external filter. As you're
concerned with sufficient gaseous exchanges through the surface though, we need
to clarify exactly what is meant by scum on the water, as I first pictured a
sort of sudsey residue on the surface -- which often indicates phosphates
-- but I'm beginning to think you mean a condition like an oil slick.
Still, an internal filter should not be thought of as promoting this,
Most often, this comes from decay -- if it doesn't come directly from oily
foods that are given, which I tend to doubt your giving. Removing the top layer
of water will not reduce contaminents in the tank, if by that you mean the
first 2 or 3 inches of water. If you can somehow remove the actually
surface of the water along with this film, this will reduce the problem greatly,
but will not address the source of the problem. I still feel that the
problem is coming from the food, even though it may be a more acceptable type.
Likewise, high phosphate oftem comes from the food if it's not balanced
correctly. Let us know what your feeding and in the interum, try increasing the
aeration -- either by having your filter run a bit faster or by installing an
airstone.(requiring an air pump).
Ray </HTML>
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