Currently i have a 40 gallon long tank with a 2.5" male convict 4" female firemouth 7" common pleco and a 3.5" lutino oscar, which i understand will be much to small for these fish in a few months, but i would like to add a veiltail oscar. To reason, what size aquarium would these fish need I was thinking maybe a 90 gallon but wasnt sure if that would be too small for these guys. Id appreciate anyones comments im only a 19 year old college student who has been taking care of large cichlids for almost 7 years so please skip the basic mumbo jumbo please. lol