Ich bin ein grosse Fisch?
This has been asked to death, I know, sorry. Still can't understand why "grosse" has an -e ending in this case. It's simple nominative, no complications, right? Another example - Der grosse Umzug. If anyone has a good link that can clear up this morass of German adjective endings, it would be appreciated. So far, every site I've visited has contradictory information (not to mention examples from my own reading that do not fit their templates.)
Your sentence should read "Ich bin ein großer Fisch". http://class.georgiasouthern.edu/german/grammar/gr-adj.htm