It's a good idea for sure. I keep and breed discus and I always quarantine any new stock before adding it to my 125gallon display tank ir my 500 gallon breeding system. Also keep rays and quarantine newcomers for at least 2 months. These fish are insanely expensive and some are hard to get, so I don't take chances. I admit that I never quarantine my natives...sounds crazy, but I have really no money invested in them, and I can visually inspect fish as I catch them. I only keep fat, healthy, colorful specimens. Still risky I know, but I'm lucky so far!