Honestly, the rated 120 gph on the Rio 600 RVT doesn’t seem bad to me, a rock or some other object to break up flow perhaps.
Are you going to modify powerhead for a needle-wheel or something?
I use sponge filters on the intakes of powerhead, with or without CO2 injectors, that reduces flow somewhat.
shoggoth43;41674 said:How about an eductor? If you place a larger pipe around the existing output it will draw in water from the back of the pipe and create a larger flow with somewhat less velocity. The downside is you may end up with a lot more flow than you initially had. It will be a larger "jet" of water though so it may not be as bad. It may be completely the wrong thing for you though. FWIW, I was planning on snagging one of these for my Biocube 29 so the sizing seems fine.
Philosophos;41871 said:A rio 600 shouldn't be a problem at 120gph in a 20 gal. I've done the same sort of GPH on a power head in a tank that size with an XP1 to go with it, and it was just fine. 120+250 = 370gph which is 18.5gph/gal. This is a high flow rate, but not unmanageable.
As stated, deflection works well. Sometimes angling towards the substrateso it rolls over the foreground plants can help. Use cross-flow with a vertically mounted rain bar if you feel like really moving the CO2 around.
For anyone who doesn't want to use a Rio for the needle wheel mod, I've been using the ViaAqua powerheads without any trouble. The impellers snip nicely, and all it requires besides that is drilling a hole in the center of the intake cover. They also come with a nice adjustable fan shaped nozel for them much like the ones made by loc-line that offers more of a horizontal spread.