I just acquired some fish tanks. They are non-cycled so I'm prepared to do water changes daily. It uses a undergravel filter and a powerhead. I don't have any other filters, and I don't know how to use a heater, So, I need help fast. There are convicts in them and plecos. Please give me help in what I need to do. Also, my convict likes to lurk at the bottom, is there something I can put or do, to make them go up, or is there any small fishes I can use for that?