<a href=showthread.php?s=&postid=10919764#post10919764 target=_blank>Originally posted</a> by Hop
I think that if you thought it through, you could do it all via gravity and only need one return pump. I wouldn't put the po4 reactor(s) on the fuge, move them to the sump. And the UV should feed the skimmer compartment, not another fuge, otherwise the dead matter will just land on the bottom, rather than collected and removed by the skimmer. In all actuality, it's more complex than it needs to be and I don't see the benefit of an extra 18 gallon fuge, other than another place for crud to collect and force the system to process it.
The easiest setup would be a 30 gallon sump and a single 18 gallon fuge IMO.