Do sea anemones need light?
A lot of sea anemones have a facultative ectosymbiotic
relationship with zooxanthellae and/or zoochlorella. Obviously
these need light to carry out photosynthesis, and so in that sense
yes, they do need light. However it is not really the anemone that
needs the light, it's the algae and the anemone can survive without
the algae, so in that sense no, they don't need light. It depends
on what you meant by the question.