Hi, I've had my tank for 4 months but 3 wks ago a fish "disappeared" and it took me basically removing everything from my tank to finally find a dead half fish, that was 2 wks ago. So around that time i did notice that my water parameters suffered and i did water changes to help stabilize things. I also noticed a bloom of brown algae and this almost transparent fluff, that I can see very well because it's so tiny. It covered most of my tanks glass walls and it keeps coming back. What is it? Is it bad? Will it go away?