Ok, I have put spgingtales in most of my tanks, and in the thumb tanks they are just about infested with the. I had to remove the leaf litter as it was just crawling with them. Now I know this is good, and I'm not concerned, except for that they may not get any vitamins from the ffs I feed then since the springtales are all over. I have a retic that is just HUGE, and very fat. I think this is due to the amount of springtales in the tank.