that's a sign of stress.
normal LTA don't put out slimy stuff even when it's moving
Mine put out slimy stuff when I first put it in the tank, now it's still moving slightly but no more slime.
what kind of condition is your tank?
light, livetstock, PH level, temp, water paremeter?
If the condition is not right, ur LTA will cont. to release slimy stuff.
they do have some slime that they give off...thats what clowns use to stay alive in the anenome. they rub in it so the anenome thinks the clown is part of it. dont worry about the slime. once your anenome finds its place it wont move and give off slime