This is my 6th time growing but the 1st time at my friends house. I have never seen anything like the algae we are getting in and on the pots. We are growing in a 70/30 coco perlite mix. When we water the run off is super green. They are watered almost daily, which is fine for coco. At least once a week my friend forgets and doesn’t water. Would it be bad to cover just the top of the pots with a black bag to deprive the algae of light?
I use a breathable mulch mat to keep light off grow medium.
I just cut it to size and put hole in middle and put on top.
Let it dry out as much as possible, that will help to kill algea presest. Cover the top of the coco like @Hashtonbutcher suggested to help prevent more development.