Importance of Water Column Flow - Calculate

Croosh Said;
The idea of closed loop is to have a closed system that doesn't involve
overflow. Most overflows are rated for certain flow rate and in most
cases you'd want more circulation that they are designed for.
Depending on the type of organisms you are keeping, fro 58G tank you
might want from flow rate from as low as 250 GPH to 1200GPH or even
more than that. If your overflow is rated at 600GPH, even 10x tank
turnover rate will max it out. (On the other hand, I have 1" ID
overflow handling about 800-900GPH from QuietOne 4000, so you might be
safe there...)


Im learning something here guys, im grasping the realization that the
overall column flow is system critical.

can somebody possibly help me figure out what my system flow is?

currently i have a temporary setup.

I have one Penguin 802 powerhead in the tank blowing water out near the
surface causing a fantastic amount of surface wave action, and another in a
5gal bucket sump. the siphon is a 1/2 tube, any bigger and the sump cant
keep up. in the sump is another Penguin 508 power head plubmed to a 1inch
fish tubing, then clamped to 3/4 inch pvc plumbing over the top, then
carried downabout another 5 inches through 3/4 pvc to the surface of the
water.(The 60 gal tank isnt currently being kept full, but about 3/4 full.
this is to avoid too much splashing onto the hood.).

the sSump pump is submerged under only a few inches of water.

The rise is about 3ft for the sump pump, but once over the tank lip, it
drops in about 5 inches.
what does that give you?