QT O2 levels ?

[Mydoghasfleas]

I have a 20 gal QT going with my first two clownfish. I have a small HOB filter and small power head. Will this provide enough 02 or should I add an air stone as well. The fish have been in for two days and look fine. Eating and just started Prazipro treatment.

 

[Redfoxtang]

I have this setup as well except for one more small HOB filter and I have no issues with O2. Point power head towards surface and you’ll be fine.