I am NOT an expert on this at all, but it's my impression that there are two kinds of emeralds, one with small claws and one with larger ones. I *THINK* that the larger ones are more prone to damage corals. I would be curious to know what kind people have experience with and whether my suspicion is correct.
54g all-glass bowfront corner planted FW
Red tiger lilly, Rotala Indica, Sagittaria Subulata, Micro Sword, Cardinal Plant
Fluorite Black sand and gravel