Lime Green Alge

excellent point tdevil

 

if its a hard type of lime green alge im pretty sure its corraline, i get this type its hard and kind of spotty looking but it grows really slow. mine only shows up on the glass though i scrapes off hard like the purple corraline on the glass. about once a month i have to scrape it off but its not major. you can get many colors of corraline it depends on the lighting and where it grows. pinks and purples grow with the bright intesens lighting. but in lower light or shaded areas you can get green, blue, white, burgandy, yellow,and ive heard of people even getting orange corraline.

i myself used to have green, and blue and still have burgandy in the shadier spots