They are being used 24/7 atm. I'm pretty much new to the game and didn't know if it was needed. My next goal is to pick up a 50-55 gallon tank and replace the 2 20's.

Then I can make a proper sump. I'm currently going thru my first cycle using about 35 goldfish to build ammonia.

Taking you advice, I am going to remove one of the HOB MarineLand 400s. (very noisy)

Next I am going to research a protien skimmer...I prefer DIY since building is to me the exciting part.