Hi,
I have a nice feather buster that has just lost it's crown. I have in the last two day's added a Diadema urchin to help with a algea probleam i have. Could this be a probleam? The shop keeper didn't think so.
Here is the tank info:
No3:5, PH:8, PO4:0, cal 400
25 l tank. Filter is live...