My first closed loop, I have some questions about flow

[GPCRalph]

Hello,

I just received a used ~120 gal tank (5'x20"x24"h) and it is drilled with five holes. Two 1" holes for the overflow/return which I will be using a AGA Megaflow kit; and three holes in the main tank that were used for a closed loop (two 3/4" returns and one 1" intake). I have never set-up a closed loop and would like some advice. Basically, I would like to know how much flow I should be looking for in the system between the sump return and the closed loop.
For instance, how much flow does a single Megaflow overflow kit handle? For the closed loop, what pump size/type should I be looking into. I was thinking of using and OM in the future, should I be plumbing two more returns? Also, I would like to use a large intake strainer but only have seen standard sizes available and am not sure if those will clog up too easily.
I am planning more of a mixed reef including sps. I just started to read Julian Sprung's Reef Aquarium Volume 3 but would like your input and experiences.

I have bought all of the bulkheads but not sure what to do next.

Let me know any advice you may have.

Thanks,

Rafael

[dsanfilippo]

I could be wrong, but i am pretty sure a single megaflow is good for 600 gph. As for the closed loop, it really depends what kind of flow (turnover) you are looking for. With those size holes I would think ~1200 gph is about it on the allowable flow, any more than that and you will be intake pipe size limited and will cause the pump to cavitate

[ElDiabloPollo]

Yea, it really depends on what you want to keep. As far as pumps foor a CL are concerned Reeflo, Bluline, Velocity are all good in my opinion. If you want to keep alot of SPS I would consider increasing the 1" out hole to 2" and the 3/4" return holes to 1" and go with a Reeflo Hammerhead.

Also keep the flow through the sump to 5x the rank an hour or less

[GPCRalph]

Thanks... That gives me a much better ball park of how to set this up.

Rafael