What fish is right for me?

I have a pretty decent set up, a 44 gallon rectangular tank, 2 bubble pump things one strip on the bottom and then those green ones that use the suction cups to stick to the side of the tank. I also have 3 filters on there. One of the small ones from my first tank meant for 5-15 gallons. One that's meant for 15-20 gallons and one that's meant for 20-40 gallons. All working well. I used to have goldfish in there, but then I was told that that environment was unsuitable for 4 goldfish that were about 6-7 inches each. So i gave them away to someone with a pond. Now i work in an office, so the fish tank is in the office now, I can do regular maintenance on the tank 2 times a month. I can feed them daily (minus the weekends) I want 5 fish as my boss is really big into feng shui, one of the fish needs to be black. Can you please help me out and tell me what fish would be right for me?