You can use a HOB
or a sponge filter if your going to leave it running all the time, I like the emperors or the penguin biowheels, if your gonna tear it down each time, and set it up for new fish, I prefer the sponge filter.
You can remove the shrimp when the ammonia peaks and then drops and you start getting nitrite. Once there is no ammonia or nitrite, you can add fish. SG
and temp should be the same as the main tank, the only difference would be if you need to do a hyposalinity treatment for ick, or decide to do it preventatively. Then the tank should start as the same SG
as the display, but be slowly dropped to the target SG
. Another option would be to find out what your LFS
is and keep the QT
there for new arrivals and then slowly bring it up to the SG
of the display tank.