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Hydor Koralia Nano Review

I have used several powerheads over the course of the last two years. When I upgraded a 20 gallon fish tank of mine to a 40 gallon breeder, it became apparent to me that the current, rather small powerhead I had in use wouldn’t cut it. While reading reviews and looking at price tags of different powerheads, I stumbled across the Hydor’s Koralia line of powerheads.

Hydro Koralia powerheads are a little bit different compared to conventional powerheads, as they use a propeller to push water, not the usual impeller. This design gives off more of an indirect flow of water, instead of the normal direct stream given off by usual powerheads.

The Koralia Nano line (Hydor Koralia powerheads, only “nano”) has models with flow rates of either 240GPH or 425GPH and range in price from $20-28 a pop.

For my 40 gallon breeder, I purchased the 425GPH model. Like all other Koralias, the powerhead uses a combination of vibration cancelling suction cups and in/out of tank sandwich magnets to attach to the glass of a fish tank. Because of this, I have heard very little noise out of my Nano, which is virtually silent overall.

The flow rate of the Koralia is great, and has stayed consistent throughout its use. So far the only problem I have had has to do with the small ball found at the end of the powerhead. This ball is inserted into the a small hole found in the in-tank sandwich magnet/suction cup. This little ball n’ cup joint is what allows one to easily adjust the position of the powerhead. Over time however, the little ball has bent considerably, and has threatened to break on me. As long as I do not take the powerhead and magnet apart however, it should stay intact.

All in all, Hydor Koralia Nano powerheads are a great buy, due to their cheap pricing, overall quality and indirect flow.


Hydor ETH Inline Heater Review

Ever wanted your tank to have a cleaner look? So that when you look into your aquarium, you see plants and fish, and not a honking filter and heater? Well combine a canister filter with a Hydor Inline heater, and your problem is solved!

One thing about inline heaters kinda flummoxed me for a while, what does inline mean! Well simply put, inline means that you attach it in place of some of your canister filter’s tubing. This means that water, after going through your canister goes through the heating element of the heater. This means that instead of having a big Stealth heater taking up space in your tank, you can have a Hydor take much less in your stand! The Hydor ETH also heats your aquarium much more evenly when compared to in tank heaters which heat only the small portion of water that it comes into contact with.


The heater itself is positioned inside a black and blue plastic case, with a very easy to read temperature changing knob. The heater also sports a small red light that turns on whenever the heater is doing its job.

I have had my Hydor (200w, 5/8″ input version) for about two month, and I have been loving every second of it! My aquariums water stays at a very consistent 73* Fahrenheit, which is what I have it set to.

Hydor sells several different version of the ETH inline heater, all of which vary in wattage and input/output size. When buying, remember to purchase the version that not only has the proper wattage for you tank, but also has the right input/output tubing size as your canister!

Budget wise, the heater is not very expensive, usually running a solid $40-50 depending on where you buy.

In all, I highly recommend the Hydor ETH inline heater for its solid performance, no in-tank space and price!