Yes i agree, i don't know where are these large size estimates of RTBS come from (i've been hearing people saying stuff like this for years)- personally i have never seen an RTBS larger than 5inches and have never heard of anyone actually owning one larger than 6inches. I think there is a lot of misinformation on these fishes sizes, maybe people are getting RTBS confused with some other similar looking type of shark species like Black Sharks/Labeo chrysophekadion or something like that?
I did once have someone "prove" that RTBS grow to 2 or three feet. the picture posted was of a Red tailed Catfish!! one wonders about the safty of that fish! as, only, people who have never kept RTBS, could make that mistake. the question has to be, "why do they post at all"?
to me, its upsetting to read. "my RTBS has jumped out of the tank"! or "my RTBS has killed my". as i have stated. the RTBS in now, considered as "extinct" in the wild. that means the worlds stock of RTBS, are now in our tanks. is is not, incumbent, upon us to, try, and ensure, what's left, is looked after properly? however upset that makes people, when you point out their errors.