Removing cleaning crew for substrate change
I want / have to change the substrate in my 4 terrariums. I have no problem picking up the bigger animals (snails and P. Leavis lol), but how the fuck do I get the springtails and these little white isopods (cleaning crew) out of the substrate? I obviously can not flood the whole terrarium. I really have to change the substrate, but I don't want to kill every animal (I'm going to freeze it). I KNOW, I can't safe every single one, but I wanna be very careful. The gnats (FUCK YOU, YOU FUCKING BUSTARDS) are driving me insane.
I've tried nematodes, but these little fff didn't do shit. I don't feel safe using BTI, also I am not going to use neem oil.
I do have these yellow sticky things everywhere, they catch a lot of gnats, but not enough. Also I have some Hypoaspis miles, I don't wanna add more, bc they will also eat my springtails.
So yeah... The only sight I have is changing the substrate...?