So I woke up this morning to the top of the ornament in my tank covered in this stuff. I scraped it off, but I'm concerned as to what it could be?
It's a 2.5 gallon tank, with a 3I whisper filter. Not currently housing any fish(currently houses a java fern), and I dosed it with cycle as prescribed the last two days. Any ideas as to if it's a fungus or just a bacteria?