BTA feeding question

Hey,
I fed my BTA last night, a piece of squid and a piece of shrimp.. It took the squid no prob, then it took the shrimp no prob, gone in less than 6 minutes.. I checked my tank this morning and the squid was laying on the sand and the shrimp was on his tenticles.. what would make it throw it up like that? he seems content.. hasnt moved much, is always spread really wide open, but he has lost his Bubbles.

 

I never feed an anemone I have 4 small ones I feed in order to get then t cutting up size to make more to sell But in my life of a ho,me aquarium I never fed one why ? All it will do is get Huge and over run your tank. What its did was eat then discarded the waste or unneeded food. Squid is the best thing to feed them but if you have properlighting its just a waste of time and will add to the load on your tank.