Hydor Koralia's

If your tank is 29" x 20" x 18" it is a 45 gallon tank. That is way too big for nanos. I, personally, would use two Koralia 2s. Koralia 1's, not to mention nanos, don't have a lot of flow and it won't be enough for a reef tank. Using Koralia 3s are still an option if you want a lot of flow. Perhaps a single K3 in the corner will do the job. You can always add a K2 later if it isn't enough.

 

I wouldn't use the nanos,I have one in a nano tank and the flow is very minimal,also the ball joint that's supposed to allow you to angle in different directions just fits into a piece of rubber and pops out easily,not like the larger koralias which I have in another tank.I have two K1's in my 46 corner tank and that's not much flow either,I think K2's might be better.

 

the link i posted earlier for the ebay seller is cheaper, i got 2 koralia 4's shipped to my front door for $82.... big al wants $84 + shipping

 

I got two k4's shipped to my door for $73. Marineandreef.com

 

you must live close to them, great prices but only would have saved me 0.14 cents


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Hydor Koralia 4 Powerhead $35.49 $70.98

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I vote for the K 1 or 2. I've had mine for over a year and they are working great. The nano however, quit within a month and I couldn't figure out why. Plus, as mentioned earlier, it doesn't adjust well - it pops out of the rubber fitting very easily. Depending on how you position the powerhead and where it might hit other sources of flow a 1 or 2 could add a lot of movement.