Thanks for the heads up. I'm sick of making my own slurries!
Sharks at this point are black tip reef, white tip reef, nurse and a brown banded bamoboo (biggest male I've ever seen!). Have cownose and bonnets in the works and maybe a male Southern ray, too. I might be adding a few more small benthics (white spotted, epps etc...). We'll see what the future holds. Smoothounds would be a nice match to this display as well.
Canisters are pleated cartridges (20 micron, 200 square ft) inside Jaccuzi Sher-Lok units. They do a good job keeping the column clear and a pretty easy to clean. Normally something this size I'd just use sand/bead filters (clear water, cleaning means water change and extra biological), but I'm only fixing it insted of re-doing the whole design.