I've been getting what I believe is blossom end rot on my tomatoes.
Being a novice gardener I'm unsure just what is normal tomato growth.
Seems like the tomatoes stop growing at a certain point and after
several weeks the bottom of the tomato turns very dark.

I added eggshells in the bottom of the hole when they were planted,
and I've upped the amount of water they are getting.

Is there something else?

Is it normal for tomatoes to just stop growing? (Big Boy and Better
Boy and they are about 2" or so...)

Jeff