Really rough guess is about 40. The first batch has out grown the second batch a good amount so I think they have eaten most of their younger siblings.
A couple pictures of the little guys.
I did a count this time and I have 47 of them. The bigger ones are 1”.
They just got moved into the 40g with my turtle Leo. I tried to be more careful this time around while moving them. Last time I managed to kill 3 because the water was too saturated with gases.