My emerald crab who is currently carrying eggs hasn’t molted since I got her 2 months ago, I’m not really concerned that she hasn’t molted but she now has what I believe to be Cyanobacteria on her shell and legs and I don’t know how I could get it off? Any suggestions? I’d really like to avoid chemicals if possible. The bacteria is like a black sludge that was on the sand bed. I’m almost at the end of the cyano outbreak simply by cleaning and daily WCs but I’m concerned my emerald crab will die if I don’t do something to treat her.