Hello to everyone,
I have a small tropical fish tank with 4neons,2 tiger barbs, 4 zebra's and two other breeds which i can not remember the names off the top of my head, i am totally new to fish keeping and have it going now for about 3months , and out of all my fish i have only lost 2 zebra's and 1 neon. All my fish are living happily with each other now they have settled.
I have a question for you experts though, i have just changed the tank water and have noticed on the floor of the tank it is like all fluffy and cotton wool like
Not sure why have never had it go like this before, and the fish are all fine??
Can anyone help...thanx emma
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Welcome, I hope someone here can help you. It might be useful to describe your tank in depth. How many gal.? Do you have plants, what kind of substrate, filters etc. Do you check for ammonia, nitrites, and nitrates? If so what are they now? 
hi, welcome to fishlore. i think those are just dust from your gravels. think it will just settle in a day or two.
