Hi everyone, i had a question. I bought an arapaima 1 month back at 5 inch he is now 10inchs eats perfectly. He is in a 120gal growout tank all by himself. 50% water changes done alternate day. I have noticed that the arapaima yawns alot. Is it a problem or do arapaimas yawn alot? There is alot of aeration. Only thing is i have covered the tank with a glass so that he doesnt jump out. There are very very little gaps. Is this the problem?