It is fine where you have it. Just make sure you don't mix nets, buckets, etc... with the QT and your main tank.
Also the light level is fine. Ambient light is all they need.
Oh yeah, can you guys recommend a good copper test kit? I want to make sure to keep the levels safe, between .15 and .25 is the safe level right?
Correct. Make sure it doesn't get over .25 or it could mean disaster. BTW
, any reason why you don't want to try hyposalinity instead of copper? It is much less stressful on the fish and you won't have to worry about checking the copper level twice a day.