View Full Version : here is a qustion for everyone

03/29/2011, 01:31 AM
what is the best turnover rate .
here is what the set up is
80g custom tank 30x25x21
60g sump fuge and a iceapod filter and a protean skimer

the tank is being set up for softies sps and some lps

what would the best turn over be ?
and why

lighting 250 mh and 6 t5 and 80lb live rock 30 lb ls

03/29/2011, 05:18 AM
There is no "best" turnover rate and here's why -- Turnover has nothing to do with flow rates. And of course, flow rates are meaningless as well, since to get an accurate flow rate you'd need laminar flow and that's counterproductive in a reef.

You could have a turnover rate of a few tank fulls an hour and satisfy your needs for a refugium and for a skimmer. Then fill the tank with power heads to get the flow for the corals as needed. Or use a closed loop, which turns over nothing but provides plenty of flow for corals. Or you could push the entire contents of the tank through a sump every minute, a turnover of 60 times per hour, and use no other method of generating flow in the tank.

In my opinion, a refugium doesn't need a lot of flow through it to keep the refugium refreshed and process whatever you're processing. A skimmer will process whatever it can, a turnover that keeps fresh water in the skimmer chamber, so it isn't reskimming the same water, is plenty. That's not a big turnover either. So the "best" turnover, for me at least, is minimal.

But that's not enough flow to keep SPS happy, clean and fed. So using supplemental flow devices, from power heads to closed loops to surge devices and yes, even increasing turnover, is a must. And each aquarist needs to find the combination that works for them, meeting the needs of their tank inhabitants within their budget.

Either that or the "best" flow is the same as the answer to Life, The Universe and Everything -- 42.


03/29/2011, 05:32 AM
About 300-500gph thru sump. Power heads for anywhere from 20-50x tank volume. Lower end for lps/softies/clams, higher end for sps.

03/29/2011, 07:28 AM
The turnover rate through your sump should match whatever your skimmer can handle.

03/29/2011, 11:21 AM
+1 to most of what was said above.

Target your flowrate through your sump for what your skimmer can handle. Not one gallon more. Any higher flow than that is completely pointless and only adds noise to your plumbing. A quiet overflow is very nice to have. Pretty much 4-6x your sump volume per hour is usually enough for most skimmers.

In your tank, target your flowrate for your livestock and corals. Tangs and sps like higher flowrates. Cardinalfish and mushrooms not so much. Assuming you keep a mixed reef, go with the higher flowrates. I've seen some tanks that have 65x flowrate, and it doesn't look like too much.

Keep in mind that you don't just add the flowrates of every device that you add to the tank since many of them will counteract each other. Their contribution would only be cumulative if they all pushed water in the exact same direction.

03/29/2011, 05:05 PM
+1 on matching your return pump to your skimmer pump flow rate.

03/29/2011, 07:37 PM
Either that or the "best" flow is the same as the answer to Life, The Universe and Everything -- 42.