Could you please identify this. I have them all over my rock. I have some artifical live rock that it first started to appear on and it's covered with these. Is it a sponge or should I be concerned. Also I have what appears to be flat worms but they are completely white like snow flakes, not clear. I tried to take some pics but they looked blurry in the pics. I couldn't find very much info for white flatworms.
Identify this please
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