PowerHead or Rena Air Pump

[Altezza9]

I just set up my 20 galon with UGF. Currently, I have an Aquaclear 20 (formerly Aquaclear 201) which pumps 127gph. However, I will be putting 2-3 discuses and clown loaches in there. I'm worried that the waterflow may not be suitable for the discuses. I also bought a Rena air pump 100 (3Watts of power), but I'm not sure if it can handle the UGF. I may also run another air line for a windmill.
What do all of you suggest? Powerhead or air pump?

Please advise.

Thanks,

Jon

 

[Seleya]

Larger tank

or different inhabitants....