Hi new to having guppy fry. I got some new females last month and the first round of fry are about a few weeks old. I noticed about 8 fry have a bend or it kinks slightly at the peduncle (hoping I named the part properly, it's just before the tail starts). The backs are straight and there's no problem with mobility. None of the adults (2 males, 6 females) display this.
What could cause this? Genetic? Tank parameters? (Ammonium Nitrite Nitrate safe, GH 11, KH 2, pH 7.8)
What should I do with kinked tail ones? Will they outgrow this? Cull them? Start an outdoor tub (never done it before, in the Seattle area) and whatever happens happens? It's for a hobby, and I have plenty of other good fry (20+, thinking to take out the adult males). The goal is to enjoy a happy living tank.
Thanks!