Great looking Piraiba, nice to see someone that actually grew one up past 12" as many of the babies that came in just go MIA after a couple months. Growth rate is a little slower than mine was when I had it but was also growing out in a 480g pond with unlimited feeders basically. Mine went from 3-13" in about year. Slow growth for either of ours regardless compared to most SA monster cats. I like your setup also aquascape wise.