Originally Posted by
wattsupdoc
http:///forum/post/2623264
If your going to have a sand bed in the fuge, I would put all 3 drains into the sump compartment. Also, if you can lower the supplies to the CL, IMO you'll get better results. Especially with all the return lines going over the top, the drain is pulling from the surface, There's no flow on the lower portion of the tank. Actually, the returns on the closed loop would be best placed behind the rock. With the supplies picking up from 2/3ish of the way up. This will help to keep those dead zones stirred up. Placing just the supplies behind there will be fine, but you'll need to get to them from time to time.
My plan with the CL return is to put them at either end of the tank on the sides ,center,Then ill be putting line-loc "Y" so ill have 2 returns on either side.
The reason for the drains being in the top 3rd of the tank ,is in the case of leak ,i dont have to drain the whole tank.
Im not worried about flow.ill have aprox.3000 gph going through the CL plus 2- 2000 GPH powerheads alternating off of wavemaker.I plan on burying the PH in the foam rock structure ill be getting started on soon.