Algae ID

[Nalini Akolekar]

I have this weird new algae growing in my DT. Under blue light it looks red, but under white light it looks white. Can anybody tell me what it is and what I should do about it?
Thanks!

 

[Gareth elliott]

Are the ends fern shaped? Chlorophyll can fluorescence varying colours based on wave length provided so not a useful metric imo.