My tangs ferociously gobble up the nori I put in. They seem like they are hungry all the time, and they are all putting on weight. I put it about 3"x2" strip about 3 times a day and feed a cube of mysis/brine.
To give you an idea, this is 2 days worth of skimmate (dark and stinky).
Is this too much nori? How often do fellow reefers offer nori?