I have 6 med-large size tangs and I feed a 1"x4" strip every day. It doesn't last very long, maybe 10 minutes. If you feed too much the nori will degrade in your water and can impact its quality. You can try cutting down the amount, and going to alternate feeding days.
Try a few different options and see what works best for you. It can take a little while to get it right, but it worth it.
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