How do i work this heater? :)

[noahk11]

I got a Elite Submersible 5 25w for my 2.5 Gallon betta tank? I know lots of people recommend this and thats why i got it but i have NO idea how to set it. It just has a knob on the top that just has a + and - so i have no idea. Mainly because i cant tell what im setting it to. Thanks in advance!

[Slayers]

the easy way is just place that heater in the water and watch the temp adjust after a few hours + or - as needed

[Littlebittyfish]

It is safest to adjust the heater without the fish in the tank. If you decide to adjust it around with him in there keep a close eye on the thermometer.
I let the heater sit in the tank unplugged 15 minutes or so before plugging it in..once i plug it in I wait a few hours before adjusting it..sometimes they are preset at a certain temperature that just happens to be right..haha...
so once I let it heat the water for a few hours i check the temperature.. if it is a little high or low I adjust it up or down a tiny tiny bit and wait a little longer...Once I get it stable at a nice temperature I add my fish.