Aquarium Heater instructions
Your going to need a thermometer, I suggest the simple kind that's just a sticker changing colors telling you the temp, in expensive and works. Most fresh water fish like 70-76Fdeg water, saltwater fish around 60F. if the thermometer reads too low, just plug it in, turn the temp adjustment knob just until the light comes on, wait for 10-20 mins, check your temp again and repeat steps if your still too low. once set, you shouldn't have to touch it again for a long time. Higher freshwater temps in the 80's stresses the fish out, and makes their metabolism run fast. They will live, but they will also require more feedings. Too low and they will become sluggish. Completely normal. Main thing is to keep them comfortable, don't try to change the temp to quickly. That stresses them as well. 5-10deg change over and hour is usually fine for most fish. The heater is primarily used to prevent a too low temp "below 60F" if you set it to 65, you should be just fine, you house will warm the tank up in the day time in most cases and the cycle in temp helps the fish to determine daytime and nighttime better.
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