Fish Tank is a coming of age movie about Mia, an angry teenager who lives with her mother and little sister in an English housing project. It's a remarkable portrait of the ugliness of lower class English life, how poverty affects character, and how class barriers, if not racial barriers, are as strong as ever in England. The drama centers on Mia's mother's affair with a charming, handsome middle class man who brings a new level of civility to the household. The ending, however, is not happy. Brilliant performances by all the principals. At 2 hours and 5 minutes, it's a little long.