I have a purple tang, tomini tang, and a yellow tang living in a 90 gallon tank that is plumb to a 60 and a 10 gallon sump/ ref. I have nori clipped on almost 24/7 and both my tomini and purple are really fat. I’m concern that my yellow tang might have internal parasites. I only seen the yellow tang poop once and it was green, about an inch long pellet/ grain. He’s pretty skittish still, so I would drop a piece of nori rubber band on a rock in the back in addition to the veggie clip with nori. Do I need to take him out of the display and quarantine him? How would I know he actually has internal parasites? Wouldnt separating the yellow tang from the purple and tomini eventually cause aggression among them when I reintroduce the yellow tang. Could I feed my tang nori soaked medicated food in the display tank? It is a mixed reef tank with a bunch of snails and two shrimp, peppermint and cleaner. Attach is a photo after I placed some nori in the back of the tank