strange critter ID HELP

[54seaweed]

strange critter ID HELP ANYONE

just found this weird looking shell less snail critter
I snatched him out of the tank till it can be ID
looking at it from the top kind of has a lobster type tail big body small head with 2 long antennas
what in the world is this thing its about 1/2inch long and 1/4inch wide with brown spots its almost flat
is it good or bad
thanks

 

[bettaowner]

Is it on the glass? I think it's a worm of some sort.

 

[54seaweed]

yes i found it on the glass
I caught it in case its a bad guy very weird looking
got it in a container to be safe

 

[Keithhjs]

Does is have a shell? Pic looks like maybe it doesn't.

 

[54seaweed]

kind of looks like it but its kind of squishy than the body tail kind of looks like a lobster this thing is fast moves around real fast in the container

 

[54seaweed]

after doing some detective work it is not a flat worm like I was thinking
turns out its a stomatella snail
glad its a good guy

 

[Keithhjs]

Cool. I thought might gave been a Nudibranch. Glad you got an id.

 

[DWilliams]

after doing some detective work it is not a flat worm like I was thinking
turns out its a stomatella snail
glad its a good guy

I have SOO many of these guys in my tanks, if you try to grab them the usually pop there tails off.