How do I start and maintain a 10 gallon tank?

No, 76 should be fine. I have a growafrog and he is at room temperature. Those frogs are awesome. I have big pebbles things in his tank, which he has never eaten. Okay, I would change all of the filter media. The carbon bag and that stuff. Okay, once you do that if you are turn the filter on and heater. now let the tank sit for 2 weeks, so bacteria grows, which turns ammonia into nitrites and then nitrates. Do a 20% water change around every 2 weeks. Well, if you are adding fish danios are hardy fish. Guppies are hardy too. Hope I helped!