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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.

Any ideas?    

Thanks so much




A simple question: Have you sexed you Blood-Parrots? It's pretty easy, and you don't need to wait for them to be in heat to do so. Just look at the shape of the trailing tip of their dorsal (Top) fin. If it's seems rounded: Male... If it seems kinda long & pointed: Female.

I'll bet you have two males in one tank, and now one is getting it's equivalent of Bon Par (The Vulcan Mating Fever) or is just getting stir-crazy. If the latter, try a small change of decor & see what happens. For all we know, it might just want a warm rock to hide under, which will keep it from essentially setting its world on fire.

I love the comparison to Vulcan Mating Fever! Very appropriate. These are cichlids, and at least 50% very aggressive cichlids as well. They may just "decide" to go after anyone else in the tank, just because. I've never seen fish with so much day to day personality and changeability. Good advice about the hiding places.