Over the back closed loop set up.

[Jackie Blue]

I am looking to set up a over the back closed loop to increase water flow in my 75 gallon tank, but I have some questions.

How many outlets shold there be. and what should the gph be.?

 

[ChrisRD]

What do you plan to keep in the tank?

 

[Jackie Blue]

I plan to set up a reef tank

 

[Anonymous]

I think Chris meant what types of corals you plan on keeping. With soft corals, mushrooms and polyps you need less flow that LPS or SPS. I do not think there is any hard amounts. IMO for soft corals you want to circulate the volume of the tank a minimum of 20 time an hour (20x), for LPS(30x) and SPS (40x). For all corals it is best to not have a concentrated jet of water shooting at them. Either use multiple out lets or bounce the flow off of the front glass.