super highback arowana

I have a Super Highback Gold Aro 7" brought home 7 days ago. 4ft tank with a Sobo FK- 1504 sponge power filter with bio balls. Is it enough for my aro tank filtration? He started eating chicken heart pieces of 0.5inch. Once I'll feed chicken heart and once Hikari Food Sticks. But I'm really...

I brought my Arowana home yesterday. He was moving in the whole tank but today in the morning I switched on my tank led light and he got scared. After that I switched off the light and now he's swimming only at one side. My right side of 4ft tank has a power filter. Is he afraid of the flow...