It does float but if you get a large enough wad of it, it will just jam in. Sometimes a little string of it would fall out of the filter and then dangle in the current but I never really had a problem with it falling out. Worst case scenario you can take a small piece of live rock to hold it in place. Once it starts to grow it will just fill in and not move around so much.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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