I got a fluval chi 6 gallon for christmas, and it is going to be a shrimp tank. Do I need to cycle the tank? Also, is there a heater included in the kit? I cant find it so I thought it might be hidden in the filter. one last question, it is open top, so could I have an oto? I will probably cut some acrylic to cover most of the tank eventually to limit evaporation.