When I do my weekly screen cleaning that the algae sheet is covered with bubbles before I turn off the supply pump. Once the flow stops the bubbles pop and leave behind sort of like pock marks in the algae. Any idea why this is? Good, bad, something I should do about it? I still get good growth and remove a lot of algae every week, just wondering if I this is a sign of something that could be improved upon. Looks like this.
Thanks for looking.