Help picking out power heads

See here: eBay Seller: yodaslo: Home Garden, Crafts items on eBay.com

 

yea those are different then the ones on the page i linked to. they have 1/3 gph of the ones i was looking at

 

i would not put anything over the korlilia 2 in a 55 it will blow sand like a tornado and i would start out with one pump in the senter and work your way to one side see wher you like the flow the best and see if you would need a second pump

 

I had a 3 and a tunze 6045 in my 55 and it was very good. the tunze was disappointing but it was ok

 

1 Koralia 2 would not be nearly enough flow in any 55, let alone a 55 long

 

Turnover rate means the rate at which your entire tank is recirculated. Meaning if you want a 40x turnover rate in your 55, you would want 2200 GPH of total flow in your tank. That is counting skimmer, filter, powerheads, etc. Keep in mind that multiple smaller units are generally better than 1 big unit.
I would start out with a pair of the Koralia 2's, 1 in each back corner, pointing to the front middle of the tank, as cuttin suggested. Have the currents from each run directly into each other, as this will create a random, chaotic water current, which is better than just a constant steady flow. If you want also, you cab run another powerhead on the back, going the length of the tank near the bottom, this will help with deadspots and stuff collecting behind your rockwork.
I would get a pair of the Koralia 2's to start out with. Trust me, you'll be happy with them.

 

I am currently increasing my flow to 40x turnover in my 75g. I am at about 32x right now and I don't think it's enough. Koralias are great.

 

Is this what we're talking about then:

Hydor Hydor Koralia Centrifugal Water Pump Water Pumps

What's the difference between a
Hydor Koralia Centrifugal Water Pump

and
Hydor Koralia Controllable Pump / Powerhead


They look the same on the website... with different prices.

 

Yup....and get them on eBay. There is nowhere cheaper. Half off retail there, even with shipping. And I am talking new.

Here is a link to a seller I have used. They are good and have a 100% feedback rating.

NEW! Koralia 3 Pump Powerhead 850g- Corals Love WAVES ! - eBay (item 190252302119 end time Sep-22-08 09:14:28 PDT)

 

So is there not a difference? Because I see these for different prices on the same page.