I have noticed a bit of algae going on the rocks which is very hard to get off. It looks like very short hair algae. It is almost the look of a short buzzed haircut (best way I can describe it). I can crape if off with my finger nail and has a bit of a velcro feel to it when I get a small piece off. Any idea what it may be and what I can do to get rid of it? My ceriths and tang don't seem to want to touch it.



