Hi, first time post. My perimeters were bad yesterday as I had a filter (power reset and filter died). Though my pleco has had these strange growths that I noticed a few days ago that I cannot identify (I've been researching), and I am unsure of the patching (if it is new or due to recent decay in water conditions (water conditions are normally great)). I only had a couple aerators to keep it oxygenated and moving but it still had a nasty film. Today (5am, 10pm now), after I water changed (25%), threw on my new fluval 305 (plus old filters biomax and new, and carbon (plus another set of ammo chips), plus ammo-lock liquid. Everything is pristine and my levels are low, nitrates and nitrites are a little higher but satisfactory on two tests (API strips and master kit). pH is ~8.5. So I am really unsure, please take a look at the photos and hopefully we can treat him! P.S. He is a good eater, he goes nuts when I feed him his daily algae supplemental but I never catch him actually doing his own work (lethargy perhaps?). Thank you for reading as well!