<a href=showthread.php?s=&postid=10379141#post10379141 target=_blank>Originally posted</a> by seapug
Feeding indeed helps (mine does catch food, too ), but what I have read is that these guys naturally occur under somewhat protected overhangs and on vertical walls. They use their expandable bubbles to regulate surface area available for photosynthesis. When they are in lower light conditions, they expand larger to expose more surface area to capture light. It would follow that lower light conditions in protected areas on a reef probably have somewhat reduced flow as well, which keeps the bubbles from getting beat up and shredded. I may be wrong, but it's what works for me. If you currently have it in a high light, high flow area and it's not happy, it's worth trying the opposite.