I'm going to guess that these are not baby mushrooms, since they haven't left the big 'shrooms, but are instead planarians, a common pest of facilities like Lidster's. They come in on Fiji rock, ( which is very cheap, thusly winding up in great quantities in big mariculture facilities like Morgan's ) and pretty much never go away after that. They don't eat the 'shrooms or corals, but instead eat the slime on them, sometimes to detrimental effect.
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