Yo- Am I correct in believing that the German lives in the green house, drinks coffee, smokes Prince, and owns he FISH?

-- Yep.

I have the solution to "Einstein's Houses" in the 23rd puzzle section. The answer is: The FISH is owned by the German, who drinks coffee, smokes Prince, and lives in the 4th house, which is painted Green.

Is the person with the fish the German?

-- Uh huh.

The fish is owned by the German, who lives in the green house, the fourth from the left.

The full solution is (imagine five houses in a row, from left to right):

                                                                                
House 1: yellow: Norwegian: smokes Dunhill, drinks water, keeps cats            
House 2: blue: Dane: smokes Blends, drinks tea, keeps horses                    
House 3: red: Brit: smokes Pall Malls, drinks milk, keeps birds                 
House 4: green: German: smokes Prince, drinks coffee, KEEPS FISH                
House 5: white: Swede: smokes Bluemaster, drinks beer, keeps dogs

I figured out that the German owns the Fish.