Banking minnows

Need to clean out my "pond" and stock it up with a lot of minnows.
Why? If I buy minnows they come ice cold and I fish in a heated lake. Mortality is pretty instant.
Have found that if I put minnows in my "tank" they get hardened.
Anybody else?
Need to clean all the leaves and crap out.
Why? If I buy minnows they come ice cold and I fish in a heated lake. Mortality is pretty instant.
Have found that if I put minnows in my "tank" they get hardened.
Anybody else?
Need to clean all the leaves and crap out.