There's a better way to feed nori. Take a small piece of 1/2" PVC or vinyl tubing or whatever, lengthwise should be about 1/2" the width of a piece of nori. Roll a half sheet onto the tube. Take an elastic and criss-cross it over the nori, holding it in place.
Your fish will be able to "graze" the nori but not really be able to tear it apart to bits.
If you use PVC, you should probably hang it off something. I use a feeder clip on the outside of the tank, and fishing line. Vinyl tubing, being flexible, can be squished into a feeder clip that you keep on the inside.
Might take them a couple of days to get used to feeding like this, but trust me on this one ... you will never look back. This is the WayToDoIt(tm).
