Crowding the bottom of my tank?

I currently have a 20 gall standard sized tank. I currently have 1 Betta, 2 African Dwarf Frogs, 2 Red Ramshorn Snails, and 2 Royal Blue Ramshorn Snails (Basically all snails are pencil eraser sized). I had planned on also getting maybe 3 Albino Cory's and like 8-10 White Clouds.

My questions is this...
If I decided to get around 8-10 Ghost Shrimp do you think this would overcrown the tank? Or overcrowd the bottom having the Frogs and Cory's who are also bottom dwellers?

Any help is appreciated,
Curtis

Well my wife nixed my idea for the Ghost Shrimp. She said they were ugly. Who knows I might get her to change her mind in time. Anyway I was able to pick up 6 cardinal tetras. So my plan is

1 Betta (have now)
2 African Dwarf Frogs (have now)
2 Red Ramshorn Snails (pencil eraser sized right now)
2 Royal Blue Ramshorn Snails (pencil eraser sized right now)
3 Albino Cory's
8 Cardinal Tetras (Have 6 right now)

Does anyone think this is too crowded for the 20 gall or could I get a few more? Keep in mind I don't want to have to transfer any fish so I'm trying to plan so they could grow to their full capacity.

Thanks anyone for assistance,
Curtis