Lol, whered you get 3.5-5' for RTC. I have seen pics of a specimen that was 72" long without its head in a market somewhere in the amazonas. I have yet to see any pics of a hybrid longer than 4 feet so far but I do believe that they will get atleast the size of an rtc.sbuse;3335600; said:i have both my rtcxtsn grows much faster then my rtc but it doesn't mess with the rtc. they often lay together on the bottem. rtcxtsn-12", rct-5", tsn-3.5"(in diff. tank) the hybrid is suppost to get like 4'-6' and 120lbs. the rtc is like 3.5'-5' and 100lbs. tsn like 3.5'-5' and 60lbs.