Have an achillies tang in a 20 long for qt. Went in on Tuesday. Have a hob filter providing filtration. He was reported to be eating LRS fish frenzy at the store. I have tried LRS nano, frozen mysis and super brine, and red/green algae in a clip and green rubberbanded to a rock. Has eaten maybe a piece or two during each feeding, where the tank sits it's hard to watch him. I'm starting to panic. There is no signs of ich/velvet.