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Eheim Jager is great in my 10g, it is alittle long but every time I check the tank temp it’s 78 on money. DustinSend me $100 and I'll give you an answer!
I'm a firm believer that Eheim Jager is one of the best heaters.....glass twice as thick as others. The one drawback is that they are long, so make sure they fit.
That said, I don't care what heater you get, you need to get a controller. Other than a total tank controller (i.e. Apex), your next best bet is Ranco or InkBird. These will protect your tank form heater failure where your tank could get cooked.
Yup. Cobalt is by far the best. Super precise.I will always use a Cobalt Neotherm on anything small enough that it’s viable to use only one or two of them.
Second place would be an Eheim Jager.
Either one you choose run it through an apex of an ink bird.
The Fluval E Series seams like a good heater, I was seriously considering them but there was not enough room to run them in my AIO.Anyone know about the aqueon pro line or the fluval E series?
It's not just about failures. I use eheims but their internal thermostat isn't precise enough to really keep temp stable.I must be the only one who has experienced two eheim jager failures one after another. First one stuck on and the replacement leaked voltage. Both purchased new from authorized retailers. Luckly I was using the two heater method or else I would have had a total tank loss. Temp only reached 84 degrees thank god.
Look into the controllers mentioned above. Also you can check out the smart temp security from auto aqua as a simple failsafe instead of a controller. Each has their pros and cons.

