Sure is...green
http://boston.craigslist.org/gbs/for/1464432368.html
http://boston.craigslist.org/gbs/for/1464432368.html
Prob a cheap 10k halide bulb making everything yellow/green
Looks like a massive algae outbreak to me. Its on the Koralia but not on the sandbed though. I don't think its the light but I could be wrong.