have a 120 gal DT and the blenny is the last fish I need to catch to put in copper treatment after a major ich outbreak that has killed all fish except the blenny an two clowns currently in the hospital tank. He is too fast to catch. Tried pellets and net, speciman container and cornering but no luck. Thinking about ordering a fish trap and putting some algae pellets or nori in it but if anyone has advice. Need him out of the tank so I can make it fallow for 90 days