I’d go QT, just because there’s always the fish you impulse buy.Looking for opinions. I have an old 90-gallon tank that is drilled, and I was either thinking about turning it into a quarantine system or a frag system. Right now I'm leaning towards frag system because I'm going to source all my fish from vendors that quarantine and treat the fish before I buy them. For example Marine Collectors. What do you all think?