They are cool but mean as hell. You can't keep them with any other fish and who wants a single fish in one tank? Gets really boring IMO
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I wouldnt call my aba mean, just a piscivore... hes very good at being a predetor, but hes been beat up by smaller fish that i thought would become snacks for him...
as for the size a 125 should last a few years ... i agree that at 18" they slow down alot. atm my brucey is in a 40 breeder thats a low light setup with some plants and enjoys hiding and dare i say playing around them. hes about 1 yr old and was 3" or so when i got him. i would say a 120 would last 4 yrs with the extra depth for turning space ect and a 180 being ideal... but a 125 may work.
btw love the set up egon!