Closed loop question

[ConsultantERP]

I see all these big systems or even small one's with a closed loop for flow. From the pics it looks like may of these are simply a hole in the side of the tank that is plumbed to a high output pump. My question is, "How do these system keep from sucking in there fish?". Maybe I'm missing something but if you running 2000gph through a 100 gallon tank and there is just a hole in the side for intake, your gonna loose some fish from being sucked in. :p

[Rockitmakr]

By using one of these....
http://reefcentral.com/gallery/data/500/52330FT8577.jpg
:beer:

[ConsultantERP]

I have a large red spot on my forehead from slaping myself. Thank goodness there is no one around to see how stupid I feel at this moment. The answer is obvoius now, Thanks

[Rockitmakr]

No worries mate! :thumbsup:
:beer:

[dougchambers]

Depending on how much flow you plan to push, you can split your inlets (still use the screens).

Something like this;

http://135reef.chambersohana.com/sysdesign/closedloop.jpg