^that being said, I don't think you should euthanize them. If they are swimming around normally and not showing any signs of distress, they should be fine for a while. Just watch them closely for odd behavior. Who knows, they may have years ahead of them despite their rough start.
2 cats, 2 dogs, 2 bearded dragons,1 blue tongue skink, 1 leopard gecko, 2 three toe box turtles, 2 redfoot tortoises, 1 albino cornsnake, 1 Cali Kingsnake, 2 russian tortoises, 2 RES, 21 Paddletail Newt, 1axolotl, 1 wood turtle. Dozens of fish.