hmmm very interesting discussion going on, I do like the post earlier from the mod about not rehoming other peoples fish because one does not know what behaviours they have learned or bad habits they have picked up.
Why do I like that view on the matter? Well, I have 2 pacu in this tank. rhonda was rehomed when she was at least 10 inches from a 55g with 3 5-9 inch oscars. Whereas Ron was rehomed from a 33g when he was about the size of a quarter.
Rhonda is a real bad ass, whereas Ron is mellow I have watched them to see.
So I would concur that some behaviours are traits that are born of the environment the fish is raised in.
Well as I have been sitting back and watching the discourse go on, I have made a decision. Since I did rehome the fish willingly I am about to do a tank juggle. By this I mean I am going to try to move my fish around without messing up the delicate equilibrium I have established in the various ecosystems I am running of the possible tanks that can home a fish this size.
this 140g could easily hold the 2 pacu but that causes the dilemma of where to put my africans, in my grow tank they will eat the smaller fish, in the 300g and then I am pretty sure the mass of fish would cause bad water.
the 150g would also work to hold the pacu BUT I will definitely take a bat to the pacu before I would ever mess up my front colony (J/K about the bat PUT DOWN THE FLAMETHROWER LOLOLOL)
the 300g they are in at present, there is no way I can successfully move the other fish so the pacu have to go!
my 180g smaller african community as well could hold the pacu but I am not so sure the little guys and gals would take to kindly to them and they prolly would get eaten
which leaves me with only 2 viable options of the tanks I have here
my newly set up 100g with a variety of local fish collected in the fry/minnow stage. managed to get five different types, a long standing desire of mine was to get native fish and grow them from baby stage to see what comes of it. If I have to the pacus can go in here, but, I am wondering if any of the babies would survive since the pacus have developed a taste for meat.
my new set up 180g which has all of my grow out fish, which if need be I can pick and choose the ones I am not willing to put on the chomping block ie) 4 gold severums, african peacocks etc.... and leave the rest to hide under the wood if need be. Though my iri sharks will definitely have to be moved out back to the 300g because Rhonda also has a taste for biting off their fins, which is why they are in this tank in the first place. I had to fast track this tank and used seachem stability and it made the water super cloudy, it was either this or watch my iri sharks get their fins eaten off (the tank also has a treatment to it to keep the fins from getting infected)
Now I also have 2 other big tanks coming but most probably wont have them set up for the next 3 weeks or so, I just don't want to lose my more valuable fish, so I guess the small fry will have to swim for their lives to live.