Welcome! Awesome you have a spouse willing to help you. How long have you been married?
heh Mine puts up with my "addiction."
"How long is the rcs growth period?"
To my knowledge they never stop growing. The growth just slows down as they get older.
"Does anyone feel bad emotionally about culling?"
I've found a few things to help:
a) if you have a fish or something, shrimp are on the lowest of the food chain and goes back into the circle of life.
you can also RAOK (or give away) if you so desire. You make new friends this way, but if you don't have anyone in the area who is into shrimp you may have to deal with shipping.
c) some people keep a cull tank. challenge with that is that eventually you'll have a multitude in there, too.
d) believe it or not, they can also be dried, ground up and used as food for other aquatics. (humans as well.)
Keep in mind shrimp have no brains. Just a cluster of nerves. Also, research has shown they do not feel pain.
"To those of you who do ro/di water, how do you heat it to the same temp as the tank?"
cheap heater and a 5g bucket work fine.