Good day to all! My 7 inch arowana, that I've had since it was only 2 inches, has decided to pretty much stop eating. I did some reading and still cannot figure out what the cause is. It's mouth is always opening and closing while it breaths and it's fins are starting to look a little bit tattered. I have a JD, Nile Tilapia and RTxSN in the tank with it and they don't really bother each other at all. I've done the big water changes and my tank continues to be acidic. It is 120 gallon with a fluval 404. I have just got, but not put in, some crushed coral to add to my media in order to raise the pH. The arowana has always eaten shrimp and meal worms. i even just bought some crickets hoping that might get it interested in food again. I had been feeding it every day and occasionally every other day. What do you think is going on here? More water changes perhaps?