My red devil is in a 3ft tank he is about 25cm to 28cm long and she is sitting in the 1 spot all the time and is not eating the food and she is lying on a slight angel. we feed her hikari cichid gold pellets medium size float type 4 to 8 pellets a night, we do a 50% to 75% a week gravel is vacumed cleaned once a week and the water is cloudy, we use aquar world internal filter IF800 and use a 200watt submergible heater. the tank has 2 plastic plants in it and 1 pipe for hideing. she will move up from the spot if u make her but then she will go straight back there. we use rain water for the tank.