Hi, I am completely new to the hobby. A couple of weeks ago I bought this 40g tank and little by little I have been putting it together with my children. All the decorations, filter, heater, etc are in place. We have been cycling it and carrying out tests often. The Nitrate is going down and next weekend it should be ready for the first two or three fish. The question is: what do you recommend to get as first fish? The tank is 40g and I would like to get lots of little ones rather than few bigger ones. Your comments an recommendations will be welcomed.