My tank is fairly new this summer. I haven't needed a heater because it's been so hot, until now. I just bought one and haven't used one before. I have 2 questions:
1) What would be the ideal temperature for a tank with blue gouramis, mollies, cories, and red-eye tetras?
2) When it's time to do a water change do I need to shut it off and let it cool down before adding water? Also, wait 15 minutes before pluging it back in?