Hello, me and my dad are getting a 75-200 gallon aquarium to put our clown knife, tinfoil barb, and 2 columbian sharks in. They are still pretty small and are currently in a 45 gallon tank. There is also a blue gourami, and bumblee catfish in the tank but they won't be moving to the larger tank. What size tank would be the best? Currently I feed them beefheart, bloodworms, pellets, and flakes. What should I feed them when they get larger? I know feeder fish could infect your fish but thats what most people feed theirs. What filter would work well? Also we may want to add some more tankmates. Would an oscar work? Also what are some other good tankmates? Thank You!