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Hello, this has been happening for a while now, i have a 36 gallon (120 Litre) Aqua one tank, it has one Yellow tang, Boxing Shrimp, False Gramma, Clownfish, and about 15 pieces of medium sized live rock, the tank is flowing by a Fluval 205, a single wavemaker, and 2 other filtration pumps, the selinity is around the 0.024/5 mark, we got the urchin about 3 months ago, now it is meant to be black with little tiny blue bits in the middle, with an orange circle round its anus, it has started to turn a white/purple colour, and losing little bits of its spines, i dont know its full diet, but it has been surviving, could anyone help me on this? would be very greatful. Oh yeah and we have had Black algae in the past about a couple of weeks ago, but thats sorted and all is well, but if anyone could help me with the urchin would be greatful. Thanks.
 
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