Powerhead Questions

Ok, the only flow in my tank right now is coming from the filter outlet and my protein skimmer outlet. My tank is 25gal with 40lbs LR, 1in LS.
I'm looking into the Koralia powerheads mainly unless someone has better advice.

Would a couple of the nanos do it or should I go bigger? I do not want TOO much current. I plan on adding polyps and maybe a small anemone later on down the line but for right now I just have my CUC and an oscillating dragonet (going for a more peaceful, slow paced and friendly tank.)
What do you guys suggest as far as current needs?

I was also thinking about something like this so that I can build it to fit my tank needs???
Customflo Water System Kit

 

I would go with a #2 and a #1, or two #2s. I have a #1 in a 55 with a #4. The #1 doesn't produce a very strong current at all, I was actually a disappointed, I thought 400 gph would be much more flow.

 

Ok! Yeah, that's something that I'd heard is to go one up from what you think you'll need? Something like that if I remember correctly.....

 

I have a 20G tank and this is my tank flow:
A sump/fuge return at ~500gph via Mag7 pump.
In tank I have two Koralia 1's and a Seio 620. Trust me, it's better to err on the side of more current than not enough. We are trying to mimic the natural ocean currents, and in that sense, more is better.

 

with koralias since there flow is so broad. if you have expierence with a maxijet take that flow rate and divide it by 10 to get a feel for a koralia with the same flowrate.
I have a nano the flow feels like its almost non existent its so broad, its in a 10 gallon.

a good rule is 50x flow rate. 25x50 is 1250 gph.
1250-existing pumps gph= gph of all the powerheads you should buy.

 

Awesome guys, thank you so much for the help. I think I'm going to pick up two Koralia 2's and see how that treats me. My wanter needs more than just the gentle flow it has now.... I plan on picking up a timer as well since I can use it as a wavemaker, or so I've read.

 

I think 2 Koralia 2's would be good on a 25 personally although it might depend on your rock layout and where you want to place corals etc, good choice to start anyway.

I don't think regular Koralia's work well with a regular wavemaker, they are not designed to start/stop all the time.
They make special controllable Koralias but they are a bit more expensive ($400 for 2x koralia 2's and the wavemaker designed to go with them, although most of the cost is for the wavemaker). I'm not sure if you can use the controllable koralia's on their own with a timer wavemaker or not.

Marinedepot.com Search results for 'koralia controllable', 'Hydor'

 

personaly i think more little powerheads are better than less larger ones. If they add up to the same flowrate than having more little ones will be better at causing chaotic water movement since the flow is coming from multiple directions. this is better because you wont have as many "dead spots". Think of it like this....if you add salt to a 5 gallon bucket of water and swirl it around till you make the water get that tornado effect...Notice the center of "tornado" will collect the undisolved salt. Where on the other hand if you were to stick your hand in the bucket and thrash it around violently...than you wont get any spots where undisolved salt will collect.

So putting that idea to my point...If you have two powerheads pushing out 50gph each so total of 100 gph (just to use easy numbers) the water is going to start flowing a a specific pattern and then cause dead spots for ditritus to collect. On the other hand say you have four power heads that put out 25gph...again the same total of 100gph but the flow is coming from various directions than you will have less "dead" spots.

Just my opinion..