05-04-2011, 11:50 AM
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Turtles and many crayfish (sold as lobsters in some stores) will kill or injury fish in your tank. I have kept slider turtles, crayfish and mosquito fish before and every week a few fish(sometimes crayfish) would disappear. If these losses are not acceptable, you should determine what you want the focal point of the tank (turtle, lobster, fish...).
Fish or shrimp being kept with turtles or lobsters are food. Shrimp will not harm adult fish but can be eaten by medium sized fish. Many cichlids, including smallish angel fish, oscars, many loaches and sharks will easily kill shrimp.
If you want invertebrates and fish, I would stick to shrimp as they are not a risk to your fish. They are available in many colors (yellow, blue, red, red and white, clear). Keep them with small fish like Tetras, danios, guppies, cory cats, otos, and barbs.