one thing to think about also is feather dusters are filter feeders, so you are gaining a heck of an efficient filter system by having them. yes they will grow behind the rock work and against the glass where you have your rocks piled against it. If you want to stop them from growing on the back glass you are going to have to redo your rock to allow a significant amount of flow along that glass. Personally I view them as a sign of a healthy tank and I don't worry about them blocking off my back glass as there are always spaces between them to look through, they never totally block off a area.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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