I bought two of these 425 GPH circulation jets for my 40 gallon saltwater cube tank. I found it easy to install the plastic suction cups to the plastic ball on the unit by first placing the suction cup on the tile floor, and then wetting the cup opening and plastic ball with a small amount of saliva (yes gross but it works), and then firmly pushing the ball straight into the plastic suction cup socket. Once in the tank, I placed one unit in the front right side, and the other unit in the back left side to create a clockwise flow. They are placed mid depth, and angled towards the glass. These locations works great for both fish and coral. I also did not press the suction cups on the glass to hold the units in a static location, as the magnets are strong enough to hold the units from the outside of the tank without pushing the suction cup onto the inside of the tank wall. This allows me to move the jets time to time to create varying flows for the fish and corals.
One thing to note is that these units, like any motors inside your tank, will add additional heat load to your water. I have a small fan blowing across the top of my tank set on a temperature switch, which increases the evaporation rate and quickly cools the water when the temperature rises above my limits. The fan was 1/20 the cost of any decent chiller unit, much quieter, uses minimal energy and allowed me to use the saved money to buy an ATO to keep the salinity at a constant level, and keep the tank topped off with the additional evaporation load.
In summary, the engineering is sound on this circulation jet, and the price is fair. Just be careful installing the suction cup to the plastic ball pivot...
Enjoy fast, free delivery, exclusive deals, and award-winning movies & TV shows with Prime
Try Prime
and start saving today with fast, free delivery
Similar items that may deliver to you quickly
Page 1 of 1 Start overPage 1 of 1
From the manufacturer
Koralia Nano Aquarium Circulation and Wave Pump
In a world where nano tanks rule, Hydor has the solution:
Koralia Nano wavemaker and circulation pumps.
Hydor Koralia Nano Wavemaker and Circulation Pumps are compact and energy saving. The Koralia Nano Pumps are ideal to recreate in aquarium the natural and beneficial water motion of rivers and seas. Supplied with patented magnet-suction cup support for easy and safe positioning, Koralia can be connected to a controller like the Hydor Smart Wave and set to intervals of seconds, minutes or hours. Cable protector include (read instructions for correct positioning). Made In Italy by Hydor.
Features:
- Patented Magnet Suction Cup mounting allows you to position the pump on glass, acrylic and plastic aquariums and enclosures.
- Swivel the pump to direct the flow where it is needed.
- Compact in size at 2.4 inches
- Can be used with Hydor Smart Wave pump controller
|
|
|
|
|---|---|---|---|
| Koralia Nano 240 | Koralia Nano 425 | Koralia Nano 565 | |
| Customer Reviews |
3,272
|
3,272
|
3,272
|
| Price | $27.20 | $34.99 | $36.30 |
| Flow Rate | 240 GPH | 425 GPH | 565 GPH |
| Recommended Marine Aquarium Size | 10 to 15 gallons | 15 to 30 gallons | 20 to 40 gallons |
| Recommended Freshwater Aquarium Size | 16 to 38 gallons | 28 to 50 gallons | 40 to 65 gallons |
| Power Absorbed | 3.5 watts | 4 watts | 3.5 watts |
| Made In Italy | ✓ | ✓ | ✓ |
| Magnet Suction Cup Mount | ✓ | ✓ | ✓ |
| Cord Protector Included | ✓ | ✓ | ✓ |
| Hydor Smart Wave Compatible | ✓ | ✓ | ✓ |
Compare with similar items
This Item  Hydor Koralia Nano Aquarium Circulation Pump, Includes Built-In Cable Protector, 425 GPH, Measures 2.4-Inches & is Ideal for Fresh or Salt Water Use |  |  |  |  | |
| Price | $34.99 | $11.99 | $21.99 | $24.99 | $27.99 |
| Delivery | Get it as soon as Saturday, May 25 | Get it as soon as Tuesday, May 28 | Get it as soon as Saturday, May 25 | Get it as soon as Saturday, May 25 | Get it as soon as Saturday, May 25 |
| Customer Ratings | |||||
| Suction power | |||||
| Noise level | |||||
| Value for money | |||||
| Energy efficiency | |||||
| Sold By | Amazon.com | ETOSKY | CLL Pet Supplies | usmagob | FREESEA |
| power source | Ac/dc | Corded Electric | Corded Electric | Corded Electric | ac/dc |
| material | cotton | Acrylonitrile Butadiene Styrene | Plastic | — | Plastic |
| style | 425 gph | Submersible | Submersible Water Pump | Submersible | Submersible |
| maximum flow rate | 1608 liters per hour | — | 27 gallons per minute | 8.83 gallons per minute | 26.66 gallons per minute |
| weight | 0.6 pounds | 0.2 kilograms | 0.9 pounds | 0.9 pounds | 1.3 pounds |
Reviews with images
In love, beware blockages
Bought this after the 500gph made my duckweed fly around my tank. The 200gph is so much better and my fish enjoy it the same.After installing this it created a horrible noise off and on, but it was due to small floater roots sucked in the intake. It creates a strong sucking force behind the motor so beware. I was forced to move areas around to accommodate the fan.
Top reviews from the United States
There was a problem filtering reviews right now. Please try again later.
Reviewed in the United States on July 11, 2021
Size: 425 gphVerified Purchase
I got this at a discount because there was no box. Shipped in the bubble wrap white Amazon envelope. No instructions, it was simply in a plastic clear bag. The sticker on it is legit from the manufacturer. I followed the instructions on the video from the Amazon sales page. Too easy. I submerged it into the tank and plugged it in hoping I wasn’t about to fry all my fish since the electric cord goes into the water. Everything was fine and I have it towards the “ocean floor” of the tank to not allow old food to settle and instead get washed up and filtered. Great investment after suffering through red sludge cyano (that I cleared with Chemiclean!). I don’t want to have the cyano issue again and the awesome YouTube videos entitled “Five Minute Saltwater Guide” recommended it for this purpose also. I threw in some Microbacter 7 (look at me talk like I know what’s going on) and turned on this puppy on a “dark cycle” overnight for maintenance on the tank. I’ve left it on and it doesn’t make noise or anything. The fish seem to like rising the waves and otherwise don’t mine it. Great buy!
Images in this review
Top reviews from other countries
Maxi
Defective-doesn’t work
Reviewed in the United Kingdom on June 7, 2023Size: 425 gphVerified Purchase
Mende Kondinski
not working product
Reviewed in Australia on August 17, 2023Size: 425 gphVerified Purchase
RK
Best valued pumps out there! But make sure you understand what you need!!!
Reviewed in Canada on September 5, 2016Size: 565 GPHVerified Purchase
RK
Reviewed in Canada on September 5, 2016
I have seen people complain about the tank ratings post by Koralia saying they are inaccurate but I beg to differ. The ratings are there to guide you which power head provides USEFUL FLOW WITHOUT POSSIBLY UPSETTING INHABITANTS. With that said, I have had experience with all three Koralia nano power heads so I will be reviewing all three.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
All three pump generally are designed the same way. I find them very reliable and quiet but they can click when they start up so using them with a wave maker can be annoying. The magnetic mounting is probably the best feature. No more suction cup issues here! You can even slide the magnet on the external side of the glass to move or adjust the location of the pump. These magnets are STRONG so be careful not to let them slam up against your glass! Directing the power head is a little meh. The amount of tilt you get is limited and the power cord works against you and gets in the way. They all come apart the same way and are generally easy to clean. Now for the individual remarks......
First up is the Hydor Koralia Nano 240!!! This pump is pretty timid. It could be used solo in a 5 gallon. For a 10 or 15 you should consider getting 2 unless you are getting some decent water movement from another source such as a Hang-On Back Filter. Another useful feature is to simple remove that one annoying dead spot in larger tanks. They are small and can be nicely hidden from sight.
Second up is the Hydor Koralia Nano 425!! This is a sweet little pump and works great for water movement. I had three ( an example of needing more than one which came out to 1275 gallons per hour ) in a tall 25 gallon marine tank and they did a great job! From personal experience I wouldn't used these in a tank longer than 24" like a 20 gallon long ( 30" long tank ). It can't really reach far enough to the other end.
Lastly is the Hydor Koralia Nano 565!! This a new nano pump from Hydor, The pump basically looks like a 425 but with some mods to push more water. It works fabulous and if you have a 20-40 gallon tank, I would skip over the 425 and go straight to these. The extra flow is worth it, especially if your tank is of the marine type.
Overall these pumps are great. They run quiet and don't need lots of maintenance. There are fancier pumps out there for sure, but spending $50 on these versus $200 on those, these pumps are a win.
Images in this review
