hey Jacob, I can personally speak on Eheim Jager heaters, I have been in the hobby for about 16 or 17 years, the best part i like about these heaters is that they are submersible, you can run them in a sump and get rid of clutter in your show tank. if you do have it in your tank you don't need to worry about the top portion being above water so it makes it a bit easier for hiding if you don't like seeing the heater. in my experience they have always kept my tanks very stable with very little to no fluctuation in temperature. they also have a newer feature on the heater where you can correct the temp dial. for example if you have it set to 75f but your tank is only running at 72f, you can actually manipulate the dial on top so that it shows its set at 72f. also just to add i have and do run this heater on everything 10 gallon up to 120 gallon. same performance regaurdless of size, I hope this helps