Hello to all. We just recently purchased a heater about two days ago for our Betta, Bart, at the local Walmart. Although it says on the box that it's supposed to be preset and ready to go for 78 degrees plus or minus 2, it has been keeping it at a steady 74 degrees. And just yesterday we've noticed Bart is looking a little constipated, so today we are starting to fast him for a couple of days and then feed him peas (that's what we read to do). We also just started him on an aquarium salt treatment in his brand new 2 gallon tank for his fin rot. Should we return the heater? or is 74 degrees sufficient enough? Thanks.