i have a 55gal tank and i bought one 2in oscar then 3months later bought two more well now they are 13in , 8.5in, and 9in and i have a 25 gal and i bought a 2.5in red tiger mota and hes 7in so would a 125 house these fish comforably b/c i have no probs now wit the oscars the get along great they never fight or anything



