Well... Since I've stumped everyone and got a "What the hell is a hydro flo?" from albert...
This is a hydor flo:
http://www.premiumaquatics.com/Merch...ode=Wavemaking
This is what they're used for:
http://www.nano-reef.com/forums/inde...howtopic=60138
No, I'm not installing on a nanocube, I figure if they can mount on a nc's bulkhead, or a powerhead, I should be able to mount one onto a standard 3/4" bulkhead.
(Before you big reefers get idears - note they're only good to 310gph)
Andy