I have had the bigger 1 about a year,he was 8-9" when i 1st got him(he pigged out on shrimp and scallops for a year and blew up)the smaller 1 i have had about 4 monthes he was maybe 7" when i got him(he also eats like a pig)the RTC/TSN is really kinda gowing slow(compared to a reg RTC)he also doesnt seem to have the appetite of a RTC.I have had him 6 monthes and he was about 3",the Channel cat just eats like a pig all the time,i just got him 2 weeks ago.