Mold on my fish and bits everywhere

Hi Everyone I have just zebra Danios in a tank and snails and some of my danios have white fluff around their tail and it's making their tail come off and then they die!!

Also I have just done a water change and their are loads of bits in the tank floating around how do I get rid off this

Im really worried please help

need a picture that is in focus but if they are dying then it's probably a bacterial infection.

try a broad spectrum fish medication designed to tret bacteria, fungus and protozoans.

Hi. Welcome to the forum.

Could you give us a few more details?

How big is the tank?
Do you have a filter?
Do you have any readings for ammonia, nitrite nitrate and pH? What's the temperature?
When was the last water change, and how much did you change? Do you use dechlorinator?
How long have you had the fish? How many do you have?
Have you added anything in terms of treatment to the tank?

These questions may seem irrelevant to you, but they might help us pinpoint the exact nature of the problem.