Hydor Koralia Nano 425 Aquarium Circulation Pump 425 GPH

I have to say that this circulation pump is amazing. Packs a lot of punch for something the size of an egg, and it's small size is what makes it so great. With the magnet base to attach it you can basically mount this thing anywhere in the aquarium. I originally bought it to add to my AquaClear Powerhead 400 for some extra flow but I was so happy with the performance, size, and neat clean look inside the tank that I have decided to retire my old bulky powerhead and replace it by ordering another Koralia Nano 425. I have a 29 gallon BioCube and I believe 2 of them will give the perfect amount of flow for my corals. Very happy with this product and I highly reccomend it.

This works very well for my 37 Gallon. It really is quite and creates just enough circulation in my aquarium to keep the water moving nicely. I wouldn't say it does an excellent job eliminating all the "dead spots" in the tank but the fish seem much happier and my feather duster looks so nice flowing in the current.

The size is perfect for small aquariums and hides nicely next to my filter so it really isn't obtrusive.

I am considering getting a second one just to increase the flow and rid the tank of all dead spots.. I haven't decided yet but I love the product and this was the best price I found it for :)

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This is a nice addition to any reef tank. It's fairly small and nearly silent. It's easy to setup and adjust using the magnet. The reason why I gave it 4 stars instead of 5 is because there is no adjustment for fan speed, it's all or nothing and nothing in between which would be nice in case you want to dial down the force a bit. Another nice addition would be an on/off switch, but that's not as critical. The built quality of the unit is nice. I definitely would recommend this over the Koralia 1 since this is a more compact unit and gives the same amount of force.

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This unit moves a lot of water in a broad, gentle path. The magnetic base works well; the unit is easy to reposition. The cord isn't bulky and is plenty long. The design is low-profile and much more attractive than your average power-head. So far no "suck-in" fatalities with my inverts I've even observed snails crawling over the housing without any apparent problem. Not as fully adjustable as I had hoped to achieve the optimum direction, but once set it stays put.

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recieved it in 3 days . its small and easy to move around and has a perfect water flow in the 20 .

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