Thank you for the info, I didn’t know about periphyton. I attached more photos, hopefully those are useful. I feel like my algae could be periphyton because it seems spongy and not hair-like as in filamentous algae. Does periphyton dry into a crunchy layer out of the water? I don’t think periphyton looks good at all, but do I keep it around because it seems like a wonderful “food buffet”?