I just cleaned my betta's tank and I used the last gallon of distilled water for him. I got a small bottle of water conditioner so I could use my tap water instead (to cut down the cost and the errands). I saved the water jug and put water and the right amount of conditioner in there for next time. That's ok, right?
Also, I've gotten two different pre-set heaters from Pet Smart and neither of them seem to work (I have a thermometer that indicates the temp is in the 70s). I returned the first one and the second one is currently sitting on my desk waiting to be returned. Any suggestions about what kind of heater I should get and where I can get it? I'm really frustrated about it.