I have a toadstool leather & a yellow finger leather that close up every time for several days I feed meaty type foods. Current is good on them & lighting is 220 watts of pcs in a 55 gal. Is this normal, and what causes thisif so. Is it a feeding response? I do notice that my skimmer gives out micro bubbles when meaty foods are fed, so I turned it off & it seemed to help, but the next day they were closed again. someone please help.