Could be what you feed the res too much calcium maybe
It is protein from the water. Boost up your filtration.
I think he is sick the same thing just happened to my pet rat but my mom will not take him to the vet and I am so scared of what might happen to him dose any one have a answer of what well happen
My kitten is not eating and it has yellow stuff coming out its butt 3 of our kittens have died from it and we don't have money 2 take 2 the vet what do we do