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Discussion Starter · #1 ·
And how do you know what you need for gph?

I am thinking about putting a circulation pump in my tanks from now on. I use HOB filters that are set up just slightly off center, and I worry about dead spots in the tank. I don't have the funds to get any before I fill the two 29g tanks I'm in the process of setting up, but I can add them in a month.
How do I determine what size to get? The gph rates mean nothing to me - I can't visualize the flow rate, never having seen one of these in person before. I only want a gentle flow directing water towards the HOB intake - not a strong current. At my local Petsmart the lowest gph is 500. I've seen nano tank pumps on That Pet Place that have a gph as little as 240 and up.
I'm going to run the tanks a while first- I may not even need these for a tank as small as a 29...maybe I'll wait & try them on the 55s.
any opinions are welcome!
 

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Get Koralia Nanos. They are very inexpensive and provide a gentle, broad flow, and are freakin' tiny! They are only 3.5" x 2" x 2", so they have a very small footprint and are pretty easy to hide.

If I did it again, I would get the 425gph one instead of the 240, but I have a 55gal tank, so I need to move water/debri further than you do.

Also, Amazon has the Nanos for $29.50 and $32.26, respectively.
 

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+1 for koralia nano. i have a 425 on my 29 and it works great! however at this point i believe i would recommend a 240. i have to direct mine at the surface of the water for agitation sake, but also at the glass to brake apart some of the energy.

THEY don't just force a slim column of water across the tank. they have a nice spread.. move lots of water but don't blow everything around
 

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+1 for koralia nano. i have a 425 on my 29 and it works great! however at this point i believe i would recommend a 240. i have to direct mine at the surface of the water for agitation sake, but also at the glass to brake apart some of the energy.

THEY don't just force a slim column of water across the tank. they have a nice spread.. move lots of water but don't blow everything around
Wanna trade? lol
 

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I have a 750 for my 55g. I run an eheim 2213 with spray bar and intake on right side, with the circulation pump on the top left. Normally, I would say the 750 is a bit too strong, but if you angle it correctly at the glass you can get a nice circular current going, eliminating any dead zones.
 

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If you haven't set up your tank here's a test you can do to visualize the Powerhead/HOB/Pump circulation.

Fill the tank. turn on the device. Add a few drops of food coloring to the farthest point in the tank from the device. watch/time how long it takes to circulate. The amount of food coloring used depends on tank size.

You would of course need to run this test with a complete water change more than once if you want to see how adding a 2nd device changes circulation.
 

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Discussion Starter · #9 ·
hey DogFish, that's a pretty cool idea!
I was looking at the Koralia nanos - I was happy to see them specifically mentioned by name! Thanks for telling me they have a broad spray, too - I hadn't thought that far ahead, and I wouldn't want a concentrated force of water...the 240 it is!
thanks!
 

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Discussion Starter · #11 ·
LOL ~ I've learned so much since joining, my newly gigantic brain won't fit through doors...
 

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Discussion Starter · #12 ·
btw, do any of you know how long the cord is for the Koralia Nano 240? I'd better find out before I set the tanks up...
 

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btw, do any of you know how long the cord is for the Koralia Nano 240? I'd better find out before I set the tanks up...
I actually just got one yesterday from Amazon but haven't taken it out of the box yet. I'm planning to set it up tonight, so I can let you know.

FWIW, I have a filter with 220gph and am adding the nano 240 to a 30 gallon tank.
 

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Discussion Starter · #15 ·
ok - I'm from the Dark Ages...what does FWIW mean? lol

JRMott, we have alomst identical setups - I have the Whisper HOB that's 210 gph, and I'm going to use the Nano 240, the same setup in two 29g tanks...

jedimasterben (love the name!) thanks for telling me the cord is so long, I was worried it wouldn't reach my outlet, since the outlet is on the opposite side of the tanks from where I'm putting the Nanos.
I'm pumped about setting this up! It's killing me to wait 48 hours for the silicone to cure (the silicone I used to attach the 3D backgrounds to the glass).
Are the Nanos easy to put in the tank when it's full? I don't have to drain it or anything, do I?
 

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ok - I'm from the Dark Ages...what does FWIW mean? lol

JRMott, we have alomst identical setups - I have the Whisper HOB that's 210 gph, and I'm going to use the Nano 240, the same setup in two 29g tanks...

jedimasterben (love the name!) thanks for telling me the cord is so long, I was worried it wouldn't reach my outlet, since the outlet is on the opposite side of the tanks from where I'm putting the Nanos.
I'm pumped about setting this up! It's killing me to wait 48 hours for the silicone to cure (the silicone I used to attach the 3D backgrounds to the glass).
Are the Nanos easy to put in the tank when it's full? I don't have to drain it or anything, do I?
FWIW = for what it's worth

I'm in the same boat as you are with the silicone, I just added my diy rock background last night (you can find my thread about it in the journals section if you wanna take a look)! Worst wait time ever!

And yes, the nanos are simple to attach. They use strong magnets to attach, so it's easy as pie. Then plug it in, get the right angle, and you're done!
 
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