I have a 90g with a cpr HOB overflow 1200 gph. I havnt filled the tank yet but i have a 20 gallon tall that im doing for a diy sump. I have 2 aqueon aq1700 pump rated up 450 gph for $10 bucks a piece brand new. can I just use one for return or is it possible to hook both up with pvc to joint together to give me 900 gph for return?


