+1 I have a fixed rate heater in a 3gal betta bowl... Really need to replace that heater:redface:Unless the tank is <.5 gal, it is not too small to heat. Get the lowest wattage adjustable one you can find (probably 25 watts) and play with temp settings until you get to your ideal temp. I have one in a 2 gallon betta bowl keeping temps at a consistent 81 degrees.
That being said, if you don't see any bodies they might just be very inactive from the low temps.
It depends on what you use, higher the wattage, the faster it'll heat the water, since it is a 5gallon, I cannot fathom it be a 100W heater. Most heaters have a self-control thermostat so when it reaches a certain temperature, it turns off. I don't have any experience with small heaters, but bigger ones 25+ have self-shut offs.Alright, I was under the impression that 5gal or less couldn't have a heater, but I guess I was wrong. Also, the shrimp won't get cooked near the heater?
By the way, my tank is a 5 gallon
I think this is what you meant to link: http://www.plantedtank.net/forums/showthread.php?t=754073You may also want to check out this recent thread on nano-tank heaters over in the equipment forum:
I think this is what you meant to link: http://www.plantedtank.net/forums/showthread.php?t=754073
25 watts is perfect for a 5 gallon. I have a Hydor and some cheapo ones from ebay and they all work well.