I’ve had my scape up and running since July last year, and all was going great until September when I had an invasion of a brown fuzzy substance all over my HC Cuba carpet, and also in and amongst pretty much all plants in my tank. I was advised on here it was diatoms, and to just ride it out, increase water changes and maintenance until it cleared, but eventually I gave up and completely switched the lights off for 2 months. Everything died apart from my Anubias. I cleared out and replaced most of the Tropica substrate and then replanted on 12 December and things were ok for a couple of weeks, until low and behold the same invasion returned, with a vengeance as you can see in the pictures. This stuff is literally taking over the entire tank! My question is, from the pictures, can anyone confirm if this actually is diatoms or something else? And really, just looking for any advice to get past this?