What the heck is this? 2nd try

[plum70rt]

Ok can anyone Id this Guy? 5 inches long, is it a cucumber?appeared from my rock

 

[ophiura]

Sure appears to be...do you have any Florida rock? Or was it in an LFS bay with them? Unusual to get them as a hitch hiker otherwise. Looks potentially like Holothuria floridana, but not certain. If so, it is a sand sifter. Any sign of the tentacles? Does it have branched tree like tentacles, or stubby one's? Every go on the sand?

 

[plum70rt]

Sue, this is the first time I ever saw this guy in my tank! Came from? it has short tentacles greyish color with dark spots,? what do they feed on?

 

[bang guy]

Originally posted by plum70rt
what do they feed on?
Detritus. This is a REALLY good find. Congrats!!