Hydor Koralia Evolution Aquarium Circulation Pump - Enhances Water Movement & Oxygenation for a Healthy Aquarium

Danny Chin: Works well.

United States on Aug 13, 2023

Gilles Doucet: Après une utilisation de même pas trois mois , voilà qu’il est devenue bruyant ( un hum constant ) , je l’ai foutu au vidange

Canada on Jul 27, 2023

J. THOMAS: Stands out to much needs a lower profile

United States on Jul 05, 2023

Lionel Tavares: Fonctionne très bien et silencieuse

Canada on May 20, 2023

A Brown: I have owned a few of these over the years. I have never had a problem with them, so I purchased two more for my new marine/saltwater tank.

United States on May 06, 2023

serena: Made my aquarium the right level turbulence. My fish are extremely happy.

Canada on Dec 29, 2022

Scott: THIS IS THE ONE YOU WANT!! Don't bother trying to buy a cheaper one, all the others just don't last! The Hydor is silent and powerful! The magnet makes placement very easy! (ALWAYS SLIDE UP OR DOWN TO REMOVE)

Will definitely be buying more for my other tanks.

Canada on Oct 03, 2022

Baron HutchinsonBaron Hutchinson: Bought this Model as well as the 750-850 GPH. Both developed the same problem after about 6 months of use. There is a rubber bumper attached to the inside of the grill which prevents the impeller from going into reverse when the motor starts. If you are going to attach these pumps to a unit like the Hydor Koralia Smart Wave controller which cycles the pumps on and off at the set intervals, ( in my case it's every 10 seconds ) the bumper is eventually going to break off. The repeated hitting on the bumper by the impeller is going to weaken the thin area of the grill where the bumper is mounted. Had to use lots of Super Glue Gel to reattach the broken off parts. So far they are holding up.

If you are going to have the pump running non-stop 24/7, then this problem should not occur.

Reported the issue to Hydor, they offered to send me a replacement grill. Declined, as the same thing will happen again 6 months down the road. Guess I will be switching brands.

United States on May 14, 2021

Fish TherapistFish Therapist: I still have faith in Hydor as I currently have the Korallia 240 in my 15 gallon tank, and a 565 in my 40 gallon tank. But when I picked up this shipment from the post office, the first thing I noticed was that I could hear part rattling inside the box. At home, I opened the box and found it was in pieces. Normally these pumps are completey assembled and monted in its box by the brown cardboard spacer. What I love about Korallia pumps is that they use a powerful magnet to make it secure in you tank. So by explaining this it should have been suspended in the box by the cardboard support as well. I was able to reassemble this 1400 unit and it did work, but the red pin that the motor mounts onto did not have a tight fit. This red pin as you can see in the picture. I am not sure if it was a disign flaw or a defect. I had to return it right away because if it were to slide off this red pin wihlie running in my tank, coming apart and exposing the powerful impeller, it could cause a lot of damage. I still need a new flow pump for my 75 gallon tank and planning to purcase the Korallia 1100 next time.

Canada on Oct 15, 2017

Nonsense: I want to love this power-head. It's priced right, looks good, and has a great magnetic mount. The impeller design quite simply stinks and that's the best I can say about it.

Unit #1 ran for (3) days on Hydor's own Smart Wave timer. The magnetic impeller continuously fell out of the groove and lost the ability to spin. Upon further inspection the bushing was swelled and barely allowed the shaft to spin. Amazon was top notch as usual and shipped out a brand new unit right away.

Unit #2 ran for less than 24 hours before it stopped responding. Power to the unit was fine, and I did in fact switch outlets to eliminate that as an issue.

If the impeller was removed and then reinserted the unit would usually spin back up. I did not buy the smart wave unit and these power-heads so that I have to babysit it every 15 minutes.

I am trying to get in contact with Hydor right now as I am told there is a modified impeller. Hopefully they have a fix for this issue as I cannot expect Amazon to keep sending out units until I get lucky and one works.

Update 9-24-12:

I adjusted my rating to 4 stars after getting the unit to work correctly for quite a while...

United States on Apr 21, 2012