Hello everyone, once again, I’m asking suggestions for what fish I should stock my 25 gal. tank with. First and most importantly, I want a fish with a lot of personality, one that is very intelligent, a fish similar to an Oscar’s level of intelligence, and would be fine by itself if it needed the entire 25 gal of space. This fish wouldn’t need to be very colorfull (because it wouldn’t be a showcase fish) but if it did, that would make it even better. If anyone knows any type of species of freshwater fish that fits these categories, and would be fine in a 25 gal. Tank, please reply. Thank you!