I have a group of 12 Amano shrimp that range in size from 5/8" to an inch and am wondering when I can introduce them into my 20 gallon planted tank with three Congo Tetra. The Congos are pretty aggressive and I don't want the Amanos to become snacks. Last fish I introduced into this particular tank was a SAE and they chased him relentlessly for several hours. He is fine now. Should the Amanos be fine as long as there is plenty of plant cover? I'm sure the Congos would easily be able to gobble one up even with ample plant cover though.