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HI Everyone, Happy New year! I am looking to build my own tank and I want to build 4' (or longer) tank but I am having an hard time understanding the thickness calculators online, right now I am set on the below two configurations. 60" X 24" X 20" (L X W X H ) or 48" X 24" X 20" (L...

Hello, I am having trouble with my jardini arowana. He keeps hitting the glass of his aquarium too much, he has bruises all over his body. He is 30 cm, and his tank is 3X1X1,5 meters. He is alone in the tank, and he eats well. Is it possible to have too big of a tank?