This might also fall under the category, "What did you do for your betta today?":
Last evening I gave my betta fresh water in his 5.5 gal tank. I filled the tank with lukewarm water and put into it the thermometer I bought earlier in the day. It read 80*F. By this morning the temperature in my unheated tank had fallen to 65*F, so I read the directions that came with my EHEIM Jager 25W aquarium heater (that arrived last week), and I put the heater in the tank and plugged it in.
I have a few questions: 1. Can I leave the house with the heater plugged in? 2. The heater has a thermostat with readings from 65*F to 93*F; there is an adjustable indicator by which it is (in theory) possible to set the heater to a desired temperature. The heater has been on now for several hours, and the temperature in the tank has risen from 65*F to 70*F; how much warmer is the tank likely (and realistically) to become, if the thermostat is set at 79*F? Would setting the thermostat higher than this cause the temperature in the water to rise much beyond that? (The box the heater came in says it can be used for up to 7 gal.) 3. What temperature do you keep your tanks at? That is, what is considered ideal for bettas? 4. Is it even possible for a 25W heater--or for this particular brand and model of heater--to raise the temperature in a 5.5 gal. tank to an ideal betta temperature? I thought it was, but then I read some posts here in which betta parents recounted using 50W or even 100W heaters for tanks under or at 10 gal.
Thank you for your consideration.