I just reread my post,,, it is very misleading. I have a Euroreef RS135 that is sitting on the sump bottom & causing a humming sound. What I would like to know is, what can I use for a "sandbag" if I make one. I have filter floss, if I use that, wouldn't I have to change it out every once in a while? I am hoping for something a bit more permanent,,,,,, I have seen that some people use neoprene mouse pads or silicone oven pads (from the dollar store), are these reef safe?
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Ian~
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