I can't use the clips that much anymore, my Naso has absolutely perfected how to get the sheet loose from it in a matter of seconds. I've tried different clips, the ones with the mess, etc, she gets them all. My fish prefer to eat it broken up, this is mainly my fault, but I like that they'll eat from my hand (makes it easier to catch a problem fish). I go through at least 2 sheets a day, plus the one I attempt to put in the clip (which is usually a half sheet folded again), sometimes I go through a total of 4 sheets for the day. I mix up the colors too, I have green, red, purple and brown and they get at least two types a day. They HATE the green. If you have Nori sheets, it probably is the Green stuff, and I've found that most of my fish don't really like it, try the red or purple. I have no luck with nori. I've given up and only use Ocean Nutrition and Julian Sprung's (Two Little Fishies) macro algae sheets now. The fish inhale them.