It's more of a slime algae looking thing...since I've been back, I did one water change with sand vacuum but algae re-appeared shortly after. The algae is definitely improved on rocks since then.... and I added a bunch of new snails after I got home and assessed the problem. I did another water change last thurs without vacuuming the sand.. but will vacuum at the next one.....as Guns and Roses sang... "need a little patience....yeah, could use some patience, yeah"........yeah


