Question. Does anyone know if there are heaters that are made for 1.5 gallon tanks and won't make the water too hot? I've got a 1.5 gallon tank for my crowntail Brunello and I know his water is much too cold for him. Unfortunately I can't afford a larger tank for him at the moment but I don't want him to freeze from cold water
I initially got one of these for a 1.5gallon tank since my room is extremely cold (its usually between 50-60F, and im in california!). 1 brought the temperature up to the high 60s, so i got a 2nd one that i was gonna use for my QT tank and it brought it up to a nice toasty 80F. I guess only problem is not being able to adjust it as my room gets warmer, the temp can rise a few degrees etc.
This page has a lot of choices, most are not adjustable. I would go with the ones you can adjust though simply because the automatic models are usually set for 76'ish degrees. With the experience I have in my brief time dealing with tanks (which isn't much) the ambient temperature in your house dictates the water temperature in your tank. The non-adjustable heaters mostly have a range they can meet of about 7 degrees plus/minus so if your inside temp is 62 degrees then the heater can only keep up the temp to 69 degrees or 62 + 7. I think the 78-80 range is more preferable for water temps.
I use the same type of heater in my 1.5 gallon tank as the first thread. I'm not sure what the current temperature is, I don't have a thermometer, but my house is really cold so I don't think it is above 80. His water is warm to the touch, but he is still acting just fine, so it shouldn't be dangerously hot.
I have used the mini hydor heater for 2-5 gallon tanks in a 1.5 gallon tank, and the water temperature can get up to around 85 degrees. The heater is supposed to raise the water temperature +5 degrees, but it seems to raise the water temperature a bit more in a 1.5 gallon tank. I think bettas are the most active and long lived when they are kept at a constant 78-82 degrees.