In all reality I'd LOVE to have a 50k tank for 1 or 2 red tail cats....I love those fish...they just have this quality about them and being a catfish keeper at heart that's my dream. Will it ever happen? Nope. lol Even if I could keep one for several years comfortably I'd never do it out of respect for the amazing creatures they are.
I used to be a completely north American native keeper. Loved my Esox species so I collected pickerel.
Now that I've owned a piranha and made his tank black water....I've started swinging over to the serra side of the hobby in my mind.