That is a disease cure it
No
If the goldfish eggs appear "fuzzy" then they are growing fungus.
The type of fungus that grows horizontal to food source are said to be heterotrophic. Such fungus do not process their own food.
When mold grows on your toes.
Fungus gardens
There are fungi such as mycobiont, red fungus, and yellow fungus!
The fungus that grows on old bread comes from airborne spores in the environment. When bread is left exposed to air, moisture, and warmth, these spores can land on the bread's surface and start to grow, forming the visible mold.
When mold grows on your toes.
Fungus.
Leafcutter ants tending fungus "garden" - the fungus grows on the leaf material.
The body of a fungus is commonly called the mycelium. It grows underground and most cells within a fungus are called haploids.
A mushroom?