Great growth spurt on the Leiarius marmoratus / achara. Short-term growth can vary but over the first year, this fish grows on par with RTC, reaching about 1.5'-2' in one year. I too remember being astounded by the growth rate of my acharas. Jau grows slower in my hands, perhaps 1' in the first year. YMMV.
Sorry about the juruense. They are touchy when small and require increased attention and care, if they prove to be finicky with feeds offered or in general uncomfortable. They'd do better isolated then.