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The problem I am having has to do with siphoning the sand/crushed gravel bed without harming all the feather dusters that are living in it. If I siphon them will it kill them? I have tried to pick them out but they are so tiny I can't get a hold of them.

Hi I am new to this site and glad to learn there is a place too get advise. I have a 150gallon saltwater reef tank. I bought rock with a lot of feather dusters on it and now they have multiplied. I have about 25 new ones that have moved to the floor of my tank. I need to do a water change but I...