When I first tried nori on a pipe with elastic band, the fish were all freaked out about the white pipe. But eventually after the first bold one started to eat, the others slowly didn't want to be left out. Took several days though. They just have to get used to it and when they do, your slow snails will only get tidbits that float and settle somewhere else.
As mentioned, the personality of fishes varies greatly. I have a coral beauty that is a pussy. The flame angel on the other hand...
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