Yes it would need to cycle, but you could jump start its cycle with water and LR from your own tank. Then just take the LR out when the cycle is done. All you need is like a 20-30 gallon tank, hob filter, heater, and a powerhead and maybe some pvc the fish can use to hide in. Obviouslly itll be awhile before a QT is ready for you, but its a good long term investment for you to keep sickness out of your main tank.