New bio-wheels take 2 weeks to seed if spinning on a cycled tank and 4-6 weeks if on a un-cycled tank. I'd wait another week and then use right away or add an ammonia source to keep the bacteria alive.
The amount of fish you can add to your QT is dependent on the QT tank size. Generally for QT purposes 1" per two gal
of water is acceptable due to the short duration. Of course as already mentioned you run the risk of infecting a healthy fish if put with a sick one.
keeping the qt tank sg
the same as the main can be too stressful for newly acquired fish/inverts unless you keep your main at 1.019-1.022 sg
which is where most fish stores/online places keep their sg
If you keep your main closer to 1.025 sg
then even drip acclimating
for 2 hours can be stressful and can possibly cause osmotic shock in fish/inverts with the rapid change in sg
/ph leading to sickness or death depending on the change in sg
/ph that the fish was kept in.
Personally I keep my qt tank at the same level as the lfs
(ph 8.0 sg
1.019) and slowly raise the sg
/ph to the main sg
/ph of 1.025/8.3 over the course of 3+ weeks per these two articles in advancedaquarist.com.
Acclimation Procedures: Part 1
Acclimation Procedures: Part 2
The use of a refractometer
is highly recommended while performing any sg
changes whether if it’s matching lfs sg
level or main sg
level to the qt tank. Adjusting the sg
down is less stressful to fish coming from that environment and slowly raising it a little bit every other day gives them time to adjust. Since you have to keep them in the qt tank for 3+ weeks anyways it just makes sense to me to provide a less stressful environment.