It could be feeding. They extend their stomach/digestive organ to cover whatever food they are eating. Does it retract when you disturb him or stay out?
If it doesn't retract than you may have a problem.
Originally Posted by BigRedsReefs10
Did you expose it to air or more likely the lfs
did? In general though stars are pretty tough to keep and need large mature tanks to survive
I've always wondered about the "exposing to air" thing.
It doesn't seem to make sense considering that the type of starfish the op has is similar to many that frequent tide pools and are routinely exposed to the air and suffer no harm.
what is the reasoning behind it?
For sponges and other filter feeders it is logical as they may siphon in air and it may disrupt their ability to feed, but those type of starfish are not filter feeders, so I fail to see the problem.
Anyone have any solid reasoning behind this idea?