Thanks for the reply. I wasn't aware a feather duster worm looks much like some sort of plant. This poor illustration below this text is similar to what it looks like. \ / | Looking into the tank as I write this, it appears there are about 2-3 of them and about maybe an inch in height. I just seen the new growth on the rock and got excited not knowing what it was, so just had to ask. Once again, thanks for the reply!! ---- Jim (email: (bee)email@example.com) remove (bee) to email me. Xena Warrior Princess said: >>Some type of feather duster worm. Normally a good thing.