Brine shrimp only has one purpose. I believe live brine shrimp is what the collectors/distributors use to get any fish to eat otherwise fish loose their will to live and waste away. If distributors had access to other live foods they would use it, but brine shrimp is the fast, easy way. ONLY because of this need to keep fish alive long enough to be shipped, do the fish we have recognise brine shrimp as food. With tough fish, I start feeding them live baby brine, then onto frozen brine and finally train onto frozen mysis. A marine fish can't live off of brine shrimp.
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Kole are from the genus ctenochaetus and have brushes for teeth, and differ from zebrasomas and acanthurus which have the normal pointier mouth. Because of this main difference, ctenochaetus can't bite off anything. So if you have calurpa leaf, he can't eat it like another tang, but can only graze off the surface of the leaf and since the leaf moves around, he doesn't quite get in contact with it. He can eat off any other solid surface and is great at preventing hair algae buildup, but once it gets beyond a certain bushiness, he can't eat it anymore. Since his mouth is so bulbus, he is also no good at getting into the fine spaces. Ctenochaetus are as much as a denitris feeder as they are algae grazers. So keep your lights on, grow whatever slime you can on your glass and rocks and the Kole will scrape it up. You can also try wraping algae sheets around a pipe so that it's tight against it. Use a rubber band and any one of your filter pipes.
They are really hardy, I keep one in my main tank, and one in my calurpa filled refugium. I think my last one took about 10 days before it started eating and thats when I threw in live rock into the quarantine tank.