ok azndeath, at 6 bucks it is not a big loss. I will look for a 25 watt heater tomorrow. The tank is located in my office at work and the heat is set at 70, so although this isn't the optimum temperature for a betta (the only inhabitant in the tank) I feel pretty safe that it is doing better in a nice 5 gallon filtered tank than an ornamental vase with three teaspoons of water and a heck of a lot of plant roots to "eat". I will see that I find a 25 watt tomorrow and keep the 50 watt as a "spare" backup for an occation that might arrise. Thanks for your responce....