Looks like what??? Neo what? Some sort of Algae. Well you know I am thinking it could be an algae. Hey neat , someone else has it. Doesn't move at all. Nor react to touch. Seams to show up in no particular kind of place. I did have a large growth of macro algaes in my tank in the last 6 months. 8 different kinds and none of them purchased. Maybe this is just another macro algae.