roadmaster, should you be euthanised when you have a cold? No, euthanasia is only for those who are suffering and can not be cured.
Stephan, water parameters, setup information, maintenance schedule?
It does look like fungus, and it also looks bad enough to warrant medication. I recommend eSHa 2000, which is anti-bacterial and anti-fungal medication.. it is also the only one which I have found to work reliably and it does not kill the filter. If you can not do medication before tomorrow, I recommend a large (50%) water change with dechlorinated and temperature matched water today (vacuum gravel and clean filter in old tank water, while you're at it).