Quarintine Tank Question

[ryan_p]

I won't be getting tangs or anything too large because my display tank isn't big enough for them... I will probably get fish no larger than 2-3" so I figured 10G would be big enough. I was thinking about only setting it up when needed and using water from the display tank at water change time. Do I need a substrate for the 3 weeks they'll be in there? I was going to add a few large diameter pieces of pvc for hiding too. I won't have a sump until I can afford it (maybe a few months) so how can I store media in the main tank without it looking obvious? So right now my list comprises a tank, heater, HOB filter (hagen aquaclear?) what about oxygen exchange.... maybe a air pump and stone? what else do I need? can I get by without a PH?