Quote:
Originally Posted by mgloop9656
for starters why would you want to have dual overflows in a 90g tank?
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Built in redundancy is why I have dual drains in my 120. If one of them gets clogged, the tank will still drain instead of running the sump dry and flooding the display. They are in a single overflow box but there are two drains.
With a coast-to-coast overflow on a 48" tank (a 90G tank), it is easier to support the overflow box with either a single center box or with dual boxes in the corners. Otherwise you have to try to figure out how to attach it to the glass or hang it on the edge of the tank.
Quote:
Originally Posted by The Forbiden Reef
I don't mean to differ but from what I've read you want aleast 8-10 times the turnover rate also depending on the bioload.
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Are you referring to in tank flow or turnover through the sump? Turnover through the sump should be dictated, in part, by the skimmer. To be accurate, the flowrate through the skimmer compartment should match the skimmer. The flowrate through any other part of the sump won't matter as long as the sump and drain can handle it. The main reason I have ever said that flowrate through the sump itself should be matched to the skimmer is because, typically, the skimmer compartment isn't isolated from the sump flow itself.
Quote:
Originally Posted by The Forbiden Reef
I have seen a 3600 mag hooked up to 75 gal RR tank. Overkill and Loud but worked fine. Check out post 22 on this thread.
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Quote:
Originally Posted by OLDETOWNENORTHPETS
Well, I put a Mag 3600 on a single 75 gallon MegaFlow. Worked. Period.
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With what kind of drains? A standard 1" drain bulkhead? My 90 has a 1" drain in it and can't handle my Mag18 wide open, I would have to see a Mag36 in that tank before I believed it. I won't say it can't happen, I would just have to see it (and probably wear ear muffs). If the drain is at the bottom of the overflow box, with no standpipe, then the rising water level will increase the pressure and help force water through the drain under pressure (its where the toilet noise comes from on a drain) but not enough pressure to force 3600 gallons through a 1" pipe.
Quote:
Originally Posted by mgloop9656
to my understanding you should have your sump turnover to be matched approximately to your skimmer so that your skimmer can run properly.
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Real close. The flowrate through the skimmer compartment should be matched to your skimmer. If your sump is designed with two water paths to the return pump, you can increase the flowrate through the sump but maintain proper flowrate to the skimmer. If your skimmer only needs 300 gph (to match the pump on it) and you have a 600 gph drain, you can tee off the drain, send 300 into the skimmer compartment and if nowhere else, you can send the other 300 to the pump chamber. It lets you increase "sump flow" without having a negative impact on the skimmer.
Quote:
Originally Posted by condiman
Ok I am just wondering how a megaflo that can handle 600 gph can keep up with a pump that is rated at 3200 gph at 4ft. How is that possible?
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I tried it with a Mag18 and had to throttle it back. I, too, am curious how they managed that.
