I feed my entire stock 3 x times a week. Mon , Wend , Sat . Leaving Thursday and Friday as off day. Been doing it this way since they were all under 5" , now they're all 20" +. 2 days ago when i attempted to do the common morning feeding, they were ignoring the prawns , which is odd.. usually my arowana , bass , clown knife go nuts for those. They didn't even attempt to go after one. Is there a disease that makes fish stop eating? if there is whats the remedi , medicine i can safely put in the tank to boost their appetite . Thank you