First off, German blues are a lot hardier than what everyone is saying. Electric blues are the sensitive ones. Second, you can keep a German blue in a 10 gallon, but that would be the ONLY fish you could keep in there, which is kind of cruel. That fish in that small of a tank would be ultra aggressive and would kill pretty much kill anything you put in there. Rams are cichlids and are territorial. They do well in communities when they have space. Shrimp are not a good idea with rams in any size tank. They will eat the shrimp. Lastly, if you maintain your tank the way you are supposed to, a 10 gallon would be stable enough for even sensitive fish/shrimp.