Try the 55 gallon drums. When blue cats get big the 55 gal size is almost too small. As predatory as blues are you will have a hard time keeping enough forage in the pond unless you have very few predators or feed them frequently.
This is great to hear as it is exactly what I'm trying to do with my pond. I want my blue cats to destroy my carp population. Which as terrible as they are, may be the best forage for blue cats.
