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Looks kinda like a skunk/porcupine [emoji1787][emoji1787][emoji23]I really like this urchin. It's fascinating to see it moving around and diging to sand.
I found some deritus in the sump. I know what I have to do next. Turn the lights off and close the door before getting the cold beer This might be the reason for the cyano problem.
Just typical Balling metod. Ca, KH and sodium chloride free salt. I also add vodka about 10-15 ml/day. In the sump there is only the skimmer, no other filter devices. As you can see on the picture the amount of the deritus is colossalTanks looking great, some of those colonies are huge, what method do you use for your dosing?