So I just moved my male veiltail betta to the 5 gallon that I used to quarantine my sword tail that had Ich. So I cleaned the tank really clean and let it sit for a while before I use it and let it filter for a day. I woke up in the morning and the temp was at the high 60s and it was way to cold and it was hiding behind its coconut house. So I did a 25 percent water change with warm water and the temp went up to 78 and the betta was moving realy happy and know he is making a tiny bubble nest.
Anyway back to the point the 5 gallon does not have a heater and I just put a desk lamp ontop to heat up the tank it he seems happy is there any prob if i keep the lamp to heat the tank? The room temp is like 72 and the water gets cold and I don't want to buy a heater for know because of money. My ten is heated by the heater in the living room and the water is perfect.