Hi Michael, sorry to be getting back to you so late but in answer to your question about emerald crabs...I have not had trouble with them eating desirable macro algaes. I am really not sure what they eat but I regularly feed frozen green foods as well as veggie pellets for the blennies. Probably the crabs are getting some of that as well.
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Genesis 1:20 -
Current Tank Info: A 56 gallon naural nutrient macro reef that flows into a 30 gallon fuge with macros/seagrass that flows into a 20 gallon sump.
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