Algae will defintely start gorwing over 90-100+ days.. or even a shorter run with an autoflower. That'll steal O2 and N at the least. Roots aren't a fan of light, either.
if you have a swap out and clean system, this may not be a big deal, if cleaned often enough, but roots still don't like light and however that might impact your grow remains.
Tape some aluminum foil around it? cardboard.. anything. spray paint the outside black might work?