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Old 05-17-2005, 04:47 PM   #1
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Closed Loop Pump Question

For more circulation, I built a closed loop system with 3 returns; one on each end and one in the middle of my tank. I had an extra Mag 7 laying around, but it was barely strong enough to make a ripple in the tank. I then bought a Mag Drive 1200, thinking it would be strong enough, and it isn't; stronger than the mag 7, but not by much. I actually use a Mag Drive 1200 running my dual megaflow with plenty of pressure/current. I'm seeing now that a 3rd return drastically reduces a pump's pushing abilities.
So, how big of a pump do i need to actually create more movement/current? I don't want so much pressure that my fish are plastered against the glass, but i would like as much comfortable turbulence as possible. Any help is appreciated, thanx.
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125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.
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Old 05-17-2005, 09:34 PM   #2
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For a reef setup your water movement should be about 20x hr. The movement at the surface may not look like much but below it may be fine. Also once you split the closed loop into 3 outputs the pressure at each output is greatly reduced. You still get the same turnover but it is dilutted into three areas. I hope I made sense in my rantings.
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28gal bowfront
40lbs livesand(bag from LFS), 30lbs live rock(LR.com)
2 O. Clowns
1 peppermint shrimp, 5 red leg hermit crabs,
4 mexican turbo snails, 15 nassarius snails
ricordea mushroom, candy cane coral,
super color polyps, hairy mushrooms
bubble coral, hawiian feather duster
coralife lunar 2x65, HOT magnum canister
10 Gal refugium(chaeto) & seaclone skimmer
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Old 05-18-2005, 04:47 PM   #3
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You made sense, i think. But when i feel the pressure from the returns, it feels weak and i don't feel it at all just 6 inches away from the return. Does that make sense? So how can it be the same turnover? I'm so confused, but i am a little slow
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125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.
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Old 05-18-2005, 10:17 PM   #4
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try thinking about it in terms of quantity instead of pressure. You pour one cup of water into a tube. One cup will come out the other end. Now take the same tube but put a y in it before the water comes out. Now there are two outlets giving 1/2 a cup each. Total is still one cup but at each outlet it seems small as it is a 1/2 cup.

Relate that to flow instead of volume and see if that helps any. One way to give a bit more pressure is to restrict the size of the output tube. The smaller the tube the more forceful the water will exit through it.
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28gal bowfront
40lbs livesand(bag from LFS), 30lbs live rock(LR.com)
2 O. Clowns
1 peppermint shrimp, 5 red leg hermit crabs,
4 mexican turbo snails, 15 nassarius snails
ricordea mushroom, candy cane coral,
super color polyps, hairy mushrooms
bubble coral, hawiian feather duster
coralife lunar 2x65, HOT magnum canister
10 Gal refugium(chaeto) & seaclone skimmer
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Old 05-19-2005, 12:25 AM   #5
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In fact, I think what you've produced is very good. You want lots of water movement (volume), without a lot of water pressure. I think that is why really nice PHs have very large diametre outputs.
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40 Gal Hex, 10 Gal Sump, CPR overflow with Mag 7 return, Maxxima 35 RO/DI, 10K MH pendant, 2 x 15W actinic, 1 yellow tail damsel, 1 high fin goby, 40lbs LR.com rock, 1 red head goby, 1 algae blenny, Leather, blastomussa, sun, and hammer corals, green polyps, carpet anemone, 2 sexy shrimp...and more LR critters than you could imagine in your worst nightmares.... Mantis in 5 gal
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Old 05-19-2005, 09:47 AM   #6
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i understand now what you are saying from your example. Thanx to both of you for your help and for saving me the money on a stronger, yet more expensive, pump.
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125gal. megaflow. Fish Residents:
Yellow Tang -(Junior), Flame Angel -(Flamey)
Bicolor Blenny -(Butch), Randall Jawfish -(Jaws)
Lawnmower Blenny -(Lenny), Talbot's Damsel -(Dottie), Tomato Clown -(Ketchup)
Nameless fish include, Neon Blenny, Singapore Shrimp Goby, Yellow Tail Damsel, 1 Skunk Cleaner Shrimps, purple pseudochromis.
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