I'm still not sure on the id because of the blurry pics, but either way it's huge and in a huge pond I helped design. This thing is a monster, and he knows other people with some large ones 40"+. They have had them for years. After a second look I am thinking it's definitely a filamentosum. I have no expirience with rous, so not sure. From what I understand they are close in the growth race though. Filas get monsterous in the wild, but not too many people have had them in the states for very long. The big ones are overseas. One of the pics he sent looks like a friend's tank with a large 4' or more fila and a 3' or more jau in the same tank along with some aros a pima ect. There's many tanks in asia that we can only dream of here in the states. All the tanks I was sent pics of were over 1k gals. One was supposed to be 4k, and the pond I believe was 20k. I cannot say more