Strange black creature

stickyfing

New Member
I bought some rock about a month ago and with it came this very strange snail-like thing. It is perfectly round and paper-thin at it's extremities (same texture as a mushroom), about 2 inches in diameter. The first time I noticed it (about a month) it was only about 3/4 inch. It has a light colored small circle in the center, but otherwise is extremely black. It has to be the blackest thing I have ever seen - really. It climbs along the glass and rocks (seemingly eating algae like a snail). When it is active, it has two long antennas that wave about and it lifts it's circular area up a bit and a "foot" is semi-visible. It moves rather quickly (faster than a regular snail). When it's at rest, it just looks like a perfect black circle that is almost indestinguishable from the rock (aside from its color). I have looked everywhere I can think of on the net, but haven't found anything even remotely similar.
 

hot883

Active Member
sounds like some kind of black nudibranch which can be bad. A picture would help us though.
 
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