frogspawn problems

[saladen]

ok for some reason my frogspawn keeps dropping off its skeleton. the first one dropped while i was at work for a day, but since then two more have dropped...those two are still at the bottom of the tank.
will these regrow? is there soemthing wrong that anyone can think of?
my local shop had no idea why. i ended up doing a 20 gallon water change..the tank is a 56 gallon.
i dont know if htis has anything to do with it, but i DID see this tentacle out of the live rock munching on algea. looked like something a syphon off a snail though my roommate swears its a worm. i figure its a snail or soemthing since it rolled into itself.
any ideas?

[tendar]

It could be a water quality issue but that is only guess. The water change may help if that is the problem. I can be difficult to guess what is happening to cause the frog to do it.
Yes if the pieces that came off do good they will attach in time to a piece of rock sand and start to grow a new colony.