As I said, you have many options. I've never had a mixture of shrimp and fish, before if that's what you mean. I only have an ecosphere which only houses shrimp that I got a Brookestone. Also, the only frogs I know of that are able to be in water their entire lives are African dwarf frogs:
http://allaboutfrogs.org/info/specie...wed_frog_t.jpg

Great webpage on them:
http://allaboutfrogs.org/info/specie...edordwarf.html

Now the shrimp I have are red shrimp, and they are in a specially built tank that you cannot open. You must keep the tank in sunlight(not direct) so algae will grow and that's what they eat. Plus, they are microscopic basically.

Here's a good shrimp webpage on LARGER varieties you can put in a tank:
http://www.petshrimp.com/shrimpspecies.html

Now, I don't know if you can keep shrimp with fish, because that's not something I have looked into. My shrimp are Red Shrimp, here's a picture of Davey Jones:


They are very tiny, too take these shots I had to use SUPER macro and then zoom in on the computer program.

Sorry for the rambling..I am glad you are interested in Cories though! I love those fish. Good luck with your tank and when you decide on the fish take plenty of pictures!

ETA: SORRY, I posted this after you decided! I'm glad you chose what you did, I think they are a great choice. Now, I'll see if I can find any answers to your questions, because I am not sure if Shrimp and Fish get along well. I am sure you don't have to worry about Cory's and Ghost shrimp though, Cory's are bred to be docile towards other critters in their environment.(or at least that's what the lady at Petco told me.)