What the heck is this!

[tucsonmike]

it has a had shell and I seen it opening up like it split in the middle and fanned out. It didn't look like a peacefull critter and I have been waking up with a dead crab like everyday and a dead blue tang. Any ideas on what it might be.

 

[lion_crazz]

Maybe you can post a picture that is a little further away?

 

[mikeyjer]

I can't see what it is either. How long have you had the tank going??? What size tank? :happyfish

 

[ophiura]

Its fuzzy for sure but it sounds like a bivalve and harmless. Common hitch hiker and not the cause of your problems. Look into water quality, tank age, etc. which are much more likely causes of loss of fish and animals.