The ammonia level is 0, nitrate is 20, nitrite is 3.0, hardness (GH) 75 soft, alkalinity (kh) 120-180, PH 7.8- 8.4. Lately I've been seeing the arowana twitch and he didn't eat at all today and he's been running into the glass. I feed him a variety of food, cricket, pellets, blood worm, and worms. I change about 25- 30% of the water. Today I did a 65% water change. I change my water once a week. I did had 4 small silver dollar and a small albino oscar. Know I only have the oscar. The silver dollar got ick so I separated them. The aro is find. I feed him about twice a day, three cricket and if not just pellets.