02-03-2009, 01:15 PM
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this is a shot in the dark, but it might be bubble algae. So it's not really an invert, though I suppose algae doesn't have a spine either
Does it move around? Or is it just growing in that one spot? If it IS bubble algae, beware popping it... popping bubble algae releases spores, and it will spread.
Many people use emerald mithrax crabs to control bubble algae. However, beware that emerald mithrax crabs eat it by popping it, thus releasing the spores. It's a double-edged sword; the crab will pop the bubbles, thus creating more, but it will also eat/pop the new ones. It creates a constant food source for the crab, but it will also create a constant population of bubble algae in your tank. Or so I've heard.