Hello I recently acquired a 55gallon Tropical Freshwater fish tank. It already had in it 2 silverdollars and 1 other fish that I just cannot remember his name he is black and orange and about 3 inches long. He is not a chiclid or a Barb and Petsmart told me he would only get about 6 inches. We already got 2 common white algea eaters and I know that we are wanting to get two Bala sharks and maybe an Eel not 100% sure on that one though. My tank finishes cycling in one week and I would basically like a list telling me what would be some good compatible semi-aggressive fish that would do okay together. I got a book and it says that too have a good tank I would need to have a good variety of Top Swimmers, Midwater Swimmers and Bottom Dwellers, but I am somewhat at a loss as to what these fish would be. I also am feeding them Tetra Fish flakes as of right now that is what they came with and have given them bloodworms once. Is that food good enough or should I look for something better. The Bala Sharks are going to be the central fish of the tank so I would like to build around them even though I already have a few. When I got the tank it was in pretty bad condition with lots of algea and junk in it. I have taken the tank and cleaned it and all of the current fish are look tons better their color looks better and they are alot more active. What plants should be present and in what amount I have five plants that are pretty much down to their nubs from the silverdollars eating them before I got them. What about objects in the tank? I want to be a good fish owner and do not want to overcrowd my tank. Advice would really be appreciated thank you all so much.