they're tougher than you think! Just pick them out with your fingers and move them to where you want them.
When I have to pick out trumpet snails I put a load in a food bag and then I have to use a rolling pin to crush them (I always do this as I think it's kinder to kill them this way than throw them in a bag and then in the bin still alive) Their shells are harder than you think
When I have to pick out trumpet snails I put a load in a food bag and then I have to use a rolling pin to crush them (I always do this as I think it's kinder to kill them this way than throw them in a bag and then in the bin still alive) Their shells are harder than you think