I like to have goals with the more easily available fish (if you live in a proper city, and not out here in the sticks). I get my rarities as I can, but there are fish in more common circulation that I look for as I visit fish civilization spots.
Yesterday, In Halifax Nova Scotia, I scored some Nannostomus beckfordi. They should have been an easy find, but nooo, not here. A ways back, I got Nannostomus marginatum, a long hunted for species, and before that Hoplisoma granti. So now, I reset, and will hunt for Iriatherina werneri, the threadfin rainbow. There's hope.
After that, I'll think of something else. One at a time. Maybe rathbuni tetras.
It's timing - the fish has to come in, but it has to do so when I'm going to the town where the good shop is.
I have good farmer/herder instincts, but the hunter gatherer lives on!