I’m pretty sure my firefish has ich, he’s the only fish in my 20 gallon and I’d rather play it safe so I’m going to put him in a nice 5 gallon quarantine. Except I want to use the 5 gallon as just like a cool GSP display tank (no fish) or something after I’m done but I’ve heard that copper can leach out of live rock after. So what other options do I have?