go BB, reason being is easy to siphon out waste, uneaten food etc. Amazing how fast NH3 can build up.
Probably could use LR as would be measuring the copper concentration so could adjust but it would then be useless to place the rock back in the display if running a reef. As for carbon, no, purpose of it is to absorb. Depending on why the QT, might also consider no medication or hyposalinity.
What I've used in my QT is PVC plumbing parts (have some 4" elbows, Tees, short pieces of pipe etc) and plastic plants. Gives hiding places and easy to rinse clean and store for when finished with the tank.
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