From the info I've read TSN cats(pseudoplatysoma fasciatum) get to be 4 feet long and 65 pounds in the wild. Whether they actually achieve this size in home aquaria I'm not certain. I'm sure it's possible with ample space, food, and clean water.
I raised one from about 2" to 18" but gave it away to a LFS after it grew too large for my 125 gallon.
I first had it in a 90 gallon show tank with a jag and 2 oscars. When the jag hit 6" it almost killed my TSN who was about 12". Targeted the eyes and head. I then moved my TSN to the 125. I hear most guapotes(dovii, jags)don't do well with bottom dwellers. Easy targets for aggression.
In my 125 my cat lived with an 8" dorado. They got along fine. No problems other than the dorado never stopped swimming and this would sometimes spook the cat causing him to smash into the glass.
I don't think your 220 or 540 g. tanks could accomadate a TSN for life. And from my experience, I wouldn't recommend keeping one permanently with your jags and dovii. Just a big dither fish to them.
I'd like to have another TSN, but the tank will have to be at least 4 to 4.5 feet wide, not to mention at least 10' long.
Good luck with whatever you choose to do, fish keeping is all about experiments and learning from your experience.
