I was browsing my tank a few days ago and noticed this weird looking algae. It seemed to have started once I had the pH corrected with API proper PH 7.0 (since my pH before this was around 8 +). This is in my 35 gallon rectangle tank and I have also noticed my two salt and pepper platys have become lethargic and always resting on the bottom (which is very unusual behavior as this pair was almost always mating). The pH is 7 and the ammonia is 0. I also have two bottom feeders (two Kuhli loaches) but no algae eater.