Going by your logic, i might as well keep my kid in a cage where he cant move. From you logic, its not your kid, so why should other people, even if i were to do it openly. Why would people care if i were to do that to MY kid. Its MY kid, not yours. If you know your fish is gunna out grow your tank, and you're not planning to upgrade, no need to add MORE fish that dont fit into it. If you KNOW your fish will outgrow your tank and you're planning to add more that dont fit in their either, then you are truly worthless.