hi everyone. i've never posted on this forum but it's been a wealth of information for me. i've been searching but i can't find an answer to my latest question. my tank has been up for over a year. over the last month or two i've noticed these small, thin brown 'spikes' growing on my rock. both on the live rock that i put in the tank when i set it up along with some old base rock i had from a few years ago. i even see it growing on the shells of my snails now. any idea what this might be?