Jimbo, given the size of the tank you are talking about, I think most would recommend 2 large power filters, 1 on each end. This gives lots of filtraton as well as a backup filter. You should also keep a cover on the tank, they will jump out if you don't. The suggestions about replacing water are critical but you normally cannot use tap water without treating it to get rid of disolved chemicals, particularly chloramin. You are better off using a natural source such as the place you collected the fish from. You will need special flourescent bulbs to grow plants well, with the attendant increase in water temp and algae growth. Even though your tank will be large, it is still small enough to experience large temp changes during the day depending on where it is placed. Fish don't do well in constant big temp swings. On the low side you can provide heating, on the high side ??? As you may be beginning to see, while this is a lot of fun, it does require some time, effort and money to do it right. I think the advice to keep it simple in the beginning is great, small mistakes are much easier to deal with.
Jim
