I have 2 parrot fish (blood parrots) that I have had for 2 years now - they are in a 75 gallon tank with a pleco. Everything was fine until one week ago - when the larger Parrot started aggressively attacking the pleco. There is no change in the tank - the water is good, there is enough food - nothing inside the tank was moved or adjusted. Nothing has changed that I am aware of and I know Parrots can become aggressive. The other parrot fish occ gets head bumped but I have never seen so much aggression in all the years I have had parrots.
Thanks so much