You got a link to this thing?beeky said:I've been thinking of getting something called the Hydor Flo. It attached to the filters output and rotates, deflecting water round the tank. There was an article that mentioned it in PFK a couple of months ago. As it uses the existing water force to rotate there's no energy consumption. It's possible that there might be a small drop in total flow but I wouldn't have thought it would be that noticeable. I reckon it would give a nice sway to reed type plants like vallis or C.helferi.
As it redirects the flow constantly it should help to avoid any 'dead' spots which you might get if the filter flow is only in one direction. It's been developed for the marine market, but could be useful in planted tanks and would also make an attractive wafting movement of the plants. Never tried it though, so it's all hypothetical. And of course, it's another piece of ugly black plastic to put inside the tank.....ty_phan said:don't know how that Hydor Flo work/help to make a circulation. If you already have it then let us know.