don't know much about the first two, but you could look them up. The Paulicea lutkeni is actually a revised species. Check Zungaro zungaro that's the new scientific name. They are frequently referred to as a Jau, or native tongue Jhau. They are the bulldogs of the pimelodidae family. They can grow to more than 7' in the wild and over 300 lbs. They are frequently caught over 200 lbs. There are many reports early in the century of this fish getting well over 500 lbs, and about 8 1/2'. I have many many pics of them over 150-200 lbs. They grow relatively slow compared to how large they can get. That being said they still maintain a growth rate similar to that of a rtc, or tsn. About 2-3" per month when small, and about 1" per month after they hit the 1' mark. I got one about 4 months ago at 12". He is now around 17" so he's been doing slightly more than 1" per month. I know of people that have had them for 3 years and they said their's was a little over 3'. So very comparible to rtc up to 3 years, and after that they maintain their slow growth for life, and their nasty attitude. Mine ate 2 fish the same size as him. He bit them in half and ate them piece by piece. Not for the faint of heart. I would say a minimum tank of 1000 gal, if not 1500 gal.