the red tail my dad had was in a 7x3x3 about 15 or 16 years ago. it was fed mostly on whole trout from the supermarket. mum went down shop and got them each week lol
the only pics i have are actual photo's. i will try and get them on here somehow, but i dunno how.
he also had a couple of TSN 30 inch+ and at one point a Oxydoras Niger that was the same length.
he's had Perrunichtys Perruno too at about 30 inch bullheads 20 inch and clarius cats 18 inch, Giant gourami's 24inch, Pacu's the size of a dustbin lid so about 24 inch plus and many cichlids like Tilapia Buttikofferi, Vieja Synspilum, Hartwegi, Amphliophous Citrinellum/Labiatum, Oscars, Jags, Blue eyed Pleco 15 inch and a red Snakehead that was in the region of 2 foot.
he's had them all at one point or another and they all got huge, they were fed loadsa food and massive water changes done very regualr. to filter it he had undergravel believe it or not, but also had 3 or 4 of the old Eheim Grey buckets with the Hobby pump 1250 on top!!
he still gets mates that he aint seen for a long time saying "you still got that massive tank?" he just laughes lol
it was one of the biggest private aquariums in the country at the time and prob the biggest Red Tail Cat in the country at the time. i was extremly surprised to hear all this when i first started out in the hobby and trade. i even did research to find out if it was wives tail or not but it was true lol ask friends, family, his old fish shop he worked in as a teenager just like me and also his old boss/LFS owner/friend of the family an he reckons that he looked after it for while and he fed it a rat, LIVE!!! and he swallowed it down whole!!
i will try and sort some pics for ya all.