It's up to you but why put fish you have had that are doing great through the stress of a newly established quarantine tank? I wouldn't I'd rather put my healthy fish into a healthy reef system than a bare bottom, PVC filled quarantine. For new arrivals, yes definite quarantine I just don't see why your healthy fish should go into quarantine. Just my .02
+1 on this, if your fish are healthy and eating, the only stress they should go through is the shift from tank to tank. QT isn't necessary.