Betta Fish Tank Heaters – First, lower Warmer archive; Lower heaters in small tanks work well but can cause fish to overheat. Choose a small oven that operates at 7.5 watts or below and check the temperature regularly with a submerged probe. Second, Terrarium heating pads; are designed to be placed on the floors of habitats for reptiles and hermit crabs are Terrarium heating pads.
Betta owners can put a fish bowl on top of these heaters and heat slowly absorbs the water. Third, betta fish tank heaters with light; well lit Betta bowls sometimes absorb heat from lighting fixtures. If this seems to be inadequate, light fixtures made for reptiles can be placed over the fish bowl. Fourth, Heating During Water Changes; during weekly water changes can be use eighty to ninety degree water.
But that the fish should be allowed to flow in a normal temperature plastic bag for half an hour so it can slowly adapt to the new temperature without much hassle. Avoid overheating; under no circumstances should a Betta bowl be heated to over ninety degrees. A Betta can easily die from overheating, and this is a particularly common risk when submersible betta fish tank heaters are used.