They don't get huge but maybe 7-8" across easily is the largest I've seen so far, I'm sure they get a little bigger than that but not going to take over your tank or anything. They do move like nems do to find a spot.
it's a carpet nem or rock nem what ever you want to call them most get no more then 4-5 inches and spread pretty well. looks to be a pretty color watch them some people consider them as bad as aptaisia
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