Mar 23, 2004 #1 V vermonter310 Aquarium Advice Activist Joined Nov 28, 2002 Messages 144 Location Maine , USA On my live rock and growing fast. Anyone know what it is?? TIA Mike
Mar 23, 2004 #2 michealprater Aquarium Advice Addict Joined Oct 3, 2002 Messages 2,311 Location Highland , IL Hard to tell, but it looks like a sponge.