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Hydor Koralia Evolution Circulation Pump/Powerhead 850 gph


Item #: HD00717

In Stock

Hydor Koralia Evolution

Designed especially to work in small reef aquariums, are part of Koralia the new innovative and unique range of circulation pumps for aquariums. The exclusive Hydor design and technology guarantee a continuous and powerful water flow which can be directed freely thanks to the special sphere shaped connection to the exclusive combination suction cup and magnet support. High performance , low energy consumption and quick and easy maintenance.

The combination suction cup + magnet can safely hold Koralia positioned in tanks with glass (or acrylic) up to 15mm – ½ inch thick.

  • Flow Rate: 850 gph
  • Power absorbed: 4.5 Watts
Koralia Pump Specifications
Koralia Model Flow Rate Wattage Dimensions Freshwater Saltwater Glass Thickness
Nano 240 240GPH 3.5W 3.5”x2”x2” 16-28GAL 10-15GAL up to 3/8”
425 425GPH 3.5W 3.5”x2”x2” 28-50GAL 40-65GAL up to 3/8”
565 565GPH 3.5W 3.5”x2”x2” 40-65GAL 20-40GAL up to 3/8”
Evolution 600 600GPH 4.5W 5.5”x2.75”x2.75” 40-80GAL 25-45GAL up to 1/2”
850 850GPH 4.5W 5.5”x2.75”x2.75” 50-100GAL 30-55GAL up to 1/2”
1150 1150GPH 5W 5.5”x2.75”x2.75” 70-140GAL 45-80GAL up to 1/2”
1300 1300GPH 6W 5.5”x2.75”x2.75” 90-175GAL 55-100GAL up to 1/2”
Magnum 1650 1650GPH 8W 6.5”x4”x4” 110-180GAL 70-100GAL 1/2” to 3/4”
2200 2200GPH 10W 6.5”x4”x4” 150-250GAL 90-150GAL 1/2” to 3/4”
3250 3250GPH 19W 6.5”x4”x4” 220-360GAL 130-220GAL 1/2” to 3/4”
Gen 3 1350 1350GPH 5.5W 4.5”x3”x3.25” 50-125GAL 40-75GAL up to 3/5”
1950 1950GPH 6.3W 4.5”x3”x3.25” 90-180GAL 55-110GAL up to 3/5”
2450 2450GPH 9.5W 4.5”x3”x3.25” 125-250GAL 75-150GAL up to 3/5”

Manufacturer information

Hydor has been producing a comprehensive range of equipment for aquariums and ponds since 1984 and offers the best in high-technology for the creation of a living ecosystem at home. The factory has developed thanks to the engineering competence of its founder and its continuous growth is based on the investment it has made in research and the development of innovative technical appliances. A competitive and dynamic structure of more than 150 employees regularly engages in the implementation of products which meet the demands of 50 nations and keep pace with the evolution of the world markets. The global quality is not a simple working method but a daily expression of mind.

4 Stars


Reviewed on
November 05, 2020

No, I would not recommend this.

Hydor has lost its reputation

Pros: Reliable magnet mount

Cons: Inoperable unit securely mounted to the glass

I've had two Evolution 850s for less than a year. Both have suffered from broken face covers, which makes them run backward. Clearly a design flaw based on similar problems mentioned on many discussion boards. Can't find aftermarket replacement parts in stock anywhere. Unable to contact the manufacturer for support. After using their products for 15 years, I'm abandoning Hydor for good.

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Reviewed on
August 12, 2020

Yes, I would recommend this.

Great pump for the price

I just replaced this pump in kind after failing from 15 years of use. Must say for the price 15 years is not a bad pay out. That pump didn’t owe me a thing.

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Reviewed on
July 15, 2020

Yes, I would recommend this.

Great pump for the price!

Pros: Cheap, reliable, great flow

Cons: 50/50 chance of starting in the opposite direction when using a controller

This is a great pump for water movement, I’ve used several these and love them. Easy to clean. My only problem is that since it’s an AC pump, there’s a 50/50 of the pump starting in the opposite direction when using a controller that turns it on/off and it makes a noticeable clicking noise when it does turn on the opposite direction.

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Reviewed on
August 30, 2017

Yes, I would recommend this.

hydor 850

Pros: simple design, easy to use, quiet

Cons: no adjustable setting for flow

very simple plug it in and point in desired direction. strong dependable current.

Was this review helpful? 1 0


Reviewed on
March 23, 2017

Yes, I would recommend this.


Pros: Holds on 1/2" acrylic, quiet,well built.

Cons: None

Looks well built, quiet and the hybrid suction cup/magnet holds it secure on my 1/2" thick acrylic tank

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timothy doyle

Reviewed on
December 07, 2016

Yes, I would recommend this.

Great pump

This little pump is one of the best pumps I have had for circulation. It is reliable easy to clean and puts out a reliable stream of water in my !00 gal tank.

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joseph ganja

Reviewed on
December 28, 2015

Yes, I would recommend this.

Great Product

I must say these are by far some of most popular and widely used aquarium circulation pumps used in this hobby by beginnners, and experienced hobbyists. I've had two koralias for about 4 years now and I never ran into any problems other than the magnetic shaft expanding due to use but Hydors customer service is AMAZING and they replaced them. Again hydor products are simply perfect for any type of experienced hobbyist.

Was this review helpful? 4 0

frank fleming

Reviewed on
November 10, 2015

Yes, I would recommend this.

seems fine

works well and long

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Reviewed on
November 04, 2015

Yes, I would recommend this.

Hydor Koralia Powerhead

I purchased two of these for my 90g SW Tank and they are working great. If you don't need anything fancy like being able to control the speed should you plan on purchasing a Tank Controller later on down the road. Then I highly recommend purchasing these Hydor Koralia

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jeff g

Reviewed on
May 04, 2015

Yes, I would recommend this.

Easy peasy

Easy to assemble and install. Good range of motion for positioning flow.

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