I have a 12" silver aro that I rescued, but I can't get it to eat anything. Its been about 2 weeks. I am at a loss, tried live feeders, fresh fish, shrimp, pellets... Water quality is good, temp is 80*, ph is a bit high at almost 8 (suspect this could be the problem). Any thoughts or tips? Also wondering how long a fish could go without eating, I am starting to get concerned.