With the shrimp, if you get a big batch i would separate any pregnant ones and place them in you "safety" tank, and the rest you leave in the main display to slowly build up a colony... Since with a tank that size 100 shrimp wont seem like much 
-edit-
1000 shrimp wont do too much damage in a planted tank, i've seen 3' tanks with probably close to 2000
Sent from my iPhone using MonsterAquariaNetwork app
-edit-
1000 shrimp wont do too much damage in a planted tank, i've seen 3' tanks with probably close to 2000
Sent from my iPhone using MonsterAquariaNetwork app