Hello. I picked up a 120 Gallon All Glass Aquarium stand that was on clearance for $25 marked down from $260 at my local petco store. The stand and a small chip in the wooden door which is the reason for it being so cheap. I am going to eventually buy a 120 gallon fish tank. All of my local fish stores tell me that the rule for freshwater aquariums is 1 inch of fish for every gallon. I would like to get 3-5 bala sharks because they are schooling fish and a iridescent shark. I have heard of some crazy stories about the ID sharks being up to 4 feet long. So if I have 5 balas that eventually grow to 12 inches each and I have one ID shark that brings me to 108 inches of fish. I know that my ID shark will most likely only grow to 2 feet like everyone else but before I buy the fish I want to make sure I will not be killing them. Please let me know if this is fine or if I would be killing my fish. Thank you