05-01-2009, 08:01 AM
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The problem with the Yellow Tail Damsel, from my personal first hand experience, is tank size. This fish is very similar in behavior to a Banded Coral Shrimp. In the proper size aquarium, they are generally very peaceful. However, when you stick them in small quarters, say 29 gallons or less, they become territorial and aggressive to new additions.
Some of the stories you hear are also due to the "cycle" process. All fish become much more aggressive during the cycle and the Yellow Tail Damsel is often used for cycling.
Finally, there are 4 or 5 different species sold as a "Yellow Tail" Damsel. When you hear stories on the internet, you can't really be sure if it is the true Yellow Tail, such as the one pictured above, or another more aggressive variety.