Alright so I thought I'd share my experience with Aqueon TA50 50 watt heaters. They're an adjustable heater and both were being used in a 10 gallon tank. The first, the original that came with the kit, was broken out of the box. I setup the tank and checked the temp the next day and lo and behold, the tank was at 86 degrees even though the heater dial was set to where what the book indicated was 77-79 degrees. I turned it down and gave it another day since there were no fish in the tank, and still it maintained 86 degrees so I returned it to the store for a replacement since it was so new. Now, two weeks into this heater, I woke up and something about the tank seemed off. All of my fish were behaving strangely so I postponed feeding and got the thermometer out since I don't trust the sticker on the tank. Surprise, Surprise! The heater had been working tirelessly all night to bring the temp from 76 degrees, where its sat steadily for two weeks, to a toasty 83-84 degrees this morning. I adjusted the knob all the way to its lowest setting, heater did NOT turn off, but guess what? Turning the knob all the way up gets it to turn off but the moment its backed down to a reasonable temperature, it kicks right back on even though the tank is well passed its appropriate temp. Since it's only 9 am no LFS is open and neither is the chain store I acquired the kit from, so I've unplugged the heater entirely for the time being until I can return it. Also, everything gets unplugged during water changes so the heater was not operating and out of water at any point. I have read good things about Eheim Jager heaters, can anybody else share their experiences? Or does anyone have some recommendations? I find it infuriating that this has happened with two different heaters from the same company over such a short time period of time. Had I not caught it when I did I very well could have lost my entire livestock and I have an attachment to all of these critters. I will more than likely not purchase another Aqueon product as this isn't my first tango with them, but we'll save that story for another thread.