Qt

[Lance]

I use 2 QTs: a permanent (cycled) 20 gal with sand, live rock, good lighting, canister filter (carbon only), PVC pieces, and decent water flow. All new fish go in this tank for 6 weeks. If a fish develops a problem I set up a 10 gal BB with power filter and PVC. I treat with hyposalinity and or copper depending on the fish.
This way a perfectly healthy fish need not undergo treatment, and I can QT inverts in the 20 gal and not worry about copper in the tank.