I started out with less than good quality fish and culling was much much easier. Now that I'm trying to greatly improve my breeding stock it is getting harder to find reasons to cull...which is both good and bad. I used to cull out everything that was crooked or bumpy or very small but now I'm second guessing myself. I culled out a fry that had a bent spine-it literally looked kinked in the center with its tail and nose pointing up and the middle bent down. Seems easy enough, right? Somehow it evaded the predator fish and grew substantially.
Now its topline looks just fine-actually quite nice-although because the fish is somewhat see through I can still see the spine inside the fish is very slightly bent. If it were a dark fish you would never know. I started to cull some of my yellows because I felt like their toplines were too humped even though I'm after the "fighter" plakat body style. Spines look perfect-just the tissue in the topline creates a hump. After letting that go for a few more weeks they seem to be evening out. I'm less than thrilled with a few lumpy heads as well. Nothing drastic but not perfect either-now I'm second guessing myself to the point I can't make a decision unless the fish is just really wonky.
What types of things should I let go that tend to straighten out as the fish grows?