Hi i have a baby arapaima in a 120gal growout tank all by himself. I got him at 5 inch 2months back and he is now 13inch. Ever since i bought the fish he has always been very very scared. He swims left to right nearly banging his head against the glass with fright. Moment i walk by he will just dash against the aquarium. He eats perfectly only at night with lights out where he cannot see me. Can some help me out and what should i do. There is nothing in the aquarium only 2 panels of the aquarium are painted black i thought that would help but its not helping.