Cobalt Aquatics Neo-Therm Heaters with Plastic LED, 25-Watt

This is the most reliable heater out there on them market today. Love how easy it is to set up and see what the heater is doing.

Compact,small,thin and has the thermometer built in. The best heater every made,i was always looking for something like this for my tanks.

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I've been looking for a good quality heater with temp control for my 2.5 gallon for over a year... I finally saw the 25W Cobalt heater (which is a higher wattage then I was looking for) for almost $50 and almost passed on it. I am so glad I didn't! Though it's a snug fit for my little 2.5 gallon, the heater is super slim and is only 6.5" long and fits in the aquarium at a slight angle, which is fine as the minimum water level is the top of the bezel (the round dial).

I've only had this heater for two days, but it raised the temp in my tank from it's usual 72-74°F (with 10W Marineland heater) to 78°F within a few hours and only fluctuated about 1/2° overnight when we turn the heat off in the house. I couldn't be happier and will definitely update my review should anything go wrong.

I DEFINITELY RECOMMEND THIS HEATER FOR 2.5 GALLON TANKS!

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Compact and sturdy with a built in readable temperature light keeps my little tank the perfect temperature. A little pricey, but in this case, you get what you pay for.

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Beautiful piece that does not feel intrusive in a tank. Not cheap, but I would consider replacing all of my heaters with this type. One of the beautiful things is it lets you know the temp of the water in the tank and the goal temp at the same time.

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