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The tank is a 3ft tank that has been up and running for the past 8 months. It has 40 kg (90 pounds) of live rock. There has not been anything new in the tank and I assume that they have been happily increasing in no's since the start. My fish would have known about them for a while. I on the other hand, have just noticed as I put in a few blue LED's for night viewing and am fascinated by the way they behave!
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