i have some questions to ask about ID sharks. as most of you know, they get very large. but then there are the ones that stay very small and there appears to be a large gap in sizes. for instance, i know a restaurant owner who has 6 ID sharks that he has had for 11 years and they are 9-11 inches in a 100(5' x 18" x 20") tank. he also said he had two that grew faster than the rest that had to be given away. also, the owner of a LFS told me that one of his customers tried to return a 42" ID shark that outgrew his 180G tank!!! so why is it that some ID sharks get very large and some that stay small? i've heard a theory saying that there are many species that are all actually referred to as ID sharks but are in-fact different species from the same area that have a large array of sizes. Does any one know this to be true? (at least if my writing is legible lol)