You will have alot more success with breeding shrimp if you don't add any fish with them until the colony is established and breeding and they have plenty of plant cover. Also, cover the filter intakes with sponges or filter bags so you don't suck out the tiny babies.
We have shrimp breeding well in a 55 gallon vivarium with guppies, but we started that tank with just plants. We let the plants sit for about a month, then added the shrimp and gave them about four or five months to get established before introducing a few guppies.
Now the guppies are getting crowded, and there are also 6 fire belly toads in the tank. But I still see juvenile and baby shrimp once in a while, and the adults are bright red and doing great. I'm sure the survival rate is much higher in the 30 gallon shrimp only tank, but I love having multiple species from different levels of the food chain thriving together in one tank.