I am in search of help with the guppies in my daughter's aquarium. We started it with 2 newts, and 5 feeder guppies with the impression that the newts would eat the guppies. We added a pleco and the guppies have multiplied and are out of control. I need something that will leave the adults alone but get rid of the babies... but it also needs to not harm the two newts. I have been reading about ghost shrimp but i am not sure if they will help maintain the population. How many would I need without overcrowding? This is only a 10 gallon tank. Please help!!!