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Old 12-12-2013, 05:12 PM   #1
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Flow for a 40 breeder

Im looking to replace my wp25 with two smaller powerheads. The wp25 is just too strong in there and my corals are getting blasted. Any advice on which powerheads to get would be appreciated. I've been looking at koralias but don't know which sizes would work. Thanks
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Old 12-12-2013, 05:29 PM   #2
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I would probably do two Koralia 600's on the 40g breeder. That'd be 30x tank volume flow and since you have two, you can play with the flow angles and try to eliminate dead spots.
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Old 12-12-2013, 05:50 PM   #3
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It's a tough tank to figure out flow from my experience. On mine, I played around with alternating Koralia 1500's, then 1 1500, then 2 850's... I got fed up with it lol and went with an MP10. Worth every cent. If you don't want to spend the money, then I agree with Rick on the 2 600's.
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Old 12-12-2013, 06:05 PM   #4
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I'm skeptical of the mp10 because I think I will get dead spots using only 1 powerhead. I figure if I use 2 I can get a better flow throughout the tank. What do you think about using a 750 and a 425? If not then I think I'll go with the two 600s.
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Old 12-12-2013, 06:12 PM   #5
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I use three korelia 425s in both of my 40s and get good amount of flow with no dead spots
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Old 12-12-2013, 06:13 PM   #6
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Quote:
Originally Posted by Aquadan View Post
I'm skeptical of the mp10 because I think I will get dead spots using only 1 powerhead. I figure if I use 2 I can get a better flow throughout the tank. What do you think about using a 750 and a 425? If not then I think I'll go with the two 600s.
The MP10 is ridiculous and and there are many settings to avoid dead spots. I watched a lot of YouTube videos before I made my decision to buy it, and was also skeptical, but it proved me wrong.

On your other inquiry, I wouldn't do a 750 and 425 as you will have a side dominating the other. Do 2 600's...
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Old 12-13-2013, 05:02 PM   #7
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So, not to steal this thread, but how do you calculate flow rate per gallons? I have a 37 gallon tall, and am running 2 nano 425's. It seems fine for the few softie corals I have now, but I would like to eventually upgrade to more flow, with a wavemaker of some sort.
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Old 12-13-2013, 05:13 PM   #8
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So, not to steal this thread, but how do you calculate flow rate per gallons? I have a 37 gallon tall, and am running 2 nano 425's. It seems fine for the few softie corals I have now, but I would like to eventually upgrade to more flow, with a wavemaker of some sort.
(425x2)/37=22.97
Your tank is turning over 37 gallons 23 times per hour.
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Old 12-13-2013, 05:22 PM   #9
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Lol. Thank Bribo, for some reason I was thinking it would be more complicated than that. Must be my blonde showing through
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Old 12-14-2013, 02:53 AM   #10
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The 23x flow is perfectly fine for your softies. Also, from my experience they tend to do better in "dirtier" water.
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