View Full Version : Waterflow for barebottom

03/29/2010, 07:58 PM
How much turnover rate should I shoot for for a barebottom 90gal?

03/29/2010, 09:47 PM
Depends a lot on what you're keeping in the tank. What livestock & corals do you have, or are you planning?

03/30/2010, 08:48 AM

03/30/2010, 11:23 AM
Enough to get rid of dead spots.

03/31/2010, 09:25 AM
Thanks. I was thinking #GPH.

03/31/2010, 08:26 PM

04/01/2010, 12:28 AM
Fish generally don't care too much, so you're looking mostly to keep the surface agitated and the bottom clear. Somewhere between 10-30x your tank volume per hour will do.

04/01/2010, 09:35 AM
Thanks. I was thinking #GPH.

I think jrlim nailed it. If you're running barebottom, I assume this is part of the strategy of keeping the tank clean. There will be no equation to tell you how may GPH, as rock work and sources of flow are going to greatly impact how much and where detritus settles. I'd recommend using as many pumps as practical to get more flow sources and fiddling with it until wastes do not collect anywhere in the tank (or if they do, they collect in an area that's easy to siphon).

04/01/2010, 11:48 AM
What kind of pumps are you planning on running? You can get rid of dead spots with relatively low GPH. I say this because if you had one pump pushing a theoretical 5kgph that may not be enough for deadspots whereas multiple pumps equating to half that could do the job just fine.

04/01/2010, 08:35 PM
I've got a Remora skimmer rated for the tank, a HOB filter and I was wondering how much flow to use for powerheads. I might use a spray bar for under the rockwork.

04/02/2010, 08:50 AM