my dad came home today with lemon cichlid that i didnt want and he puts it in the tank, now that he bought it i need t take care of it. its about a month old and its in a 10 gallon. I kno thats to small but in about 2 weeks its going into the 50 gallon when i get it. Do I need a heater right now that its in the 10 gallon??? Can I put anthing else in there?