only problem buying used is the life of the tank... seals might eventually break especially if it is say 7 - 9 yrs old. Always ask the history of the tank itself. Also, if there are things like wavemakers, it will shorten the seals. Aside from that, I highly recommend buying used just incase you don't like the hobby, you only take a small financial hit. (like buying a used/demo car as opposed to new car.. someone else takes the depreciation).
Also, true, go big ( I recommend at least 30 gallons minimum for a reef tank to achieve minimal fluations in salt water, temps, waste, etc)... probably ideal is 55 - 90 gallons... from there, it will also get potentially expensive to run in terms of heat, light, maintenace etc. not to mention heavy especially if you live upstairs.
happy reefing
regs
msjboy
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