I bought a 2 little fishes 150 reactor, couldn't resist the new toy, so it looks like I'll be rigging that up to the return with Purigen.
I've been thinking about increasing the size of the syphon to get more flow through the sump (pity, I just set that one up). I could probably crack up the flow to 3500 Lph (6x an hour instead of 4x). Removing the sponges would help the sump handle the extra flow too.
And of course, I'll definitely remove the sponges, if on the next clean they contain sludge again. I just want to see how they go with 100% 100 micron socks.
And I'm going to look into a Wet&Dry vac.