Hydor Koralia Nano 240 Aquarium Circulation Pump 240 GPH

Bought this for my planted 37 gallon tank to circulate a dead spot in my aquarium. This is my 1st Koralia or water circulation pump and was worried that it would blow away my fish and plants all over so I bought this under sized one instead of the Koralia Nano 425 which was rated for my tank size. I was surprised at how it circulates well for a big tank. It creates a dispersed and gentle current, unlike a powerhead that blasts a stream of water in a single direction. My fish has also perked up, they seem to like the gentle current and I often see them swimming around it. Also, it's nice to see the leaves on my plant sway with the current.

As for my dead spot, this little thing took care of it and water is clearer. I have it aimed down and towards my Fluval C4 and any detritus or fish poop is pushed towards it. The magnetic suction cup is awesome, it gives you flexibility of putting this Koralia anywhere in your tank without worrying about the suction cup wearing out. Did I mention the size of this thing? It's slightly larger than an egg but does not take up a lot of space. Others have mentioned the red ball clip that attaches to the magnetic suction cup may break, but in my experience it's a solid piece and unless you are putting a lot of force and stress on it, then yes it will break.

Recommend this product highly!

If you are looking to create cross flow in a small nano (I use it on my Nano cube 12) this is perfect. I had a much larger water mover in there, and it was just too much.. This is powerful enough for small tanks and created a great flow throughout the tank when paired with the Hydor spinner on the tanks pump output.

I do not think I would use this on anything larger then a 12 or bio cube 14. If I where to have a 20 long, or even a 28 nano cube I would opt for something a little more powerful.

It is small, and not very obstructive of viewing even when placed towards the front of the tank.

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I have a 29 gal reef aquarium, and I am very happy with the amount of movement its creating , I would say perfect for my 29 gal

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I really love this product. This is my second one. I searched for the smallest size and this is what I came up with. My fish seems to struggle with my larger one like they were in a sea storm which I really didn't like it seem to stress them out. I found this and I love it and the fish love it they can swim in calm sea's again! It's a great product just right for what I was looking for. The corals sway just enough and I'm very happy with this size and this product. I would recommend it to everyone and would purchase another. It is very quiet and super easy to install. price was also great

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Thanks to the reviews, I decided to give this pump a try for my 9 gallon Eheim Aquastyle saltwater nano. I've been in the hobby over 10 years mostly heavily planted, aquascaped freshwater tanks in the past from 50g to 0.5g. I've always been very pleased with the Hydor products and this one is no exception. For the quality, price and function, this is a great pump, especially on Amazon. I wouldn't go cheaper with a more inferior brand or even a more costly one that does the same thing.

I found other reviews with tank descriptions especially helpful so here's mine: my saltwater nano has 1 clownfish, 1 cleaner shrimp, cuc's and several soft corals of starburst polyps, kenya tree, pulsing xenia and mushrooms live rock and 1 inch live sand (sand is more aesthetics). Eheim's tanks are beautiful on their own, so every accessory counts going in. Most importantly, I didn't want the other inhabitants blown in a circle or with such force that they would have to hide in a corner of rock. Sure enough, based on the reviews and other research on fish boards, the open flow of this pump is gentle enough in the tank for everyone. Based on my live rock formation, I have the pump on the back left side, a little lower than mid-tank directing current toward the opposite wall with the corner filter (sand gets kicked up if placed lower). The pump creates a soft current that wraps nicely around the rocks to give the corals a gentle sweeping effect in combo with the filter flow overhead. The starburst polyps have already grown larger in the past week and the CUC's are out and about more often in the light. Another benefit is that the sand has been cleaner too, even as I increased my light hours for better tank viewing in winter.

Since I have only had the pump 2 weeks, I am giving it 4 out of 5 stars. As other reviewers mentioned, there is a slight hum to my otherwise nearly silent tank. But the animals all seem more lively and "happier" with the added flow so I'm keeping it. If the vibration gets much louder or circulation fades, I'll likely replace it with another one. Hopefully the sound remains minimal and pump lasts a couple years. If so, I would vote 5 of 5. Cheers and happy reef/fish keeping!

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