Hi, I'm completely new to aquariums...I just set up my first tank yesterday (a 10 gal) and I was letting it run for 48 hours before adding fish. i plan on keeping tropical fish. I didn't realize until today that I should get a heater so I went to walmart (there are no pet supply stores close to me) and bought a thermometer and heater. However when I put in the thermometer, it is reading 85 already without the heater. Is this because of the light? i have no fish, i plan on going to get them tomorrow, but i plan on getting tropical fish as well as a pleco and a couple of shrimp. if it is this hot, is it going to kill them? I'd rather not drive the hour to get them if they're just going to die. :/ HELPPPPPP!!!!!