Odd occurance with Bubble Tip Anemone...any thoughts?

[asylumdown]

mine withers away to almost nothing for a few hours every few days if I'm feeding it regularly. It will look 8 seconds from death and then a few hours later... happy as can be.

Not sure if that's what yours is doing, but I'm pretty sure mine does that so that it can expel waste without it's tentacles catching what it's trying to expel. I think they also like to evacuate all their water and re-inflate fresh every so often.