Return line

[RWB3]

What size returns should i install on 75 gallon 1/2 or 3/4. Also will be using two return lines. Prob will be using a 1262 eheim (900gph). I will be using a 16" shadow overflow.

 

[mcgyvr]

same size or 1 up from whats on the pump.. I'd probably use 1" but 3/4" should be fine too..