delusion of negation (nihilistic delusion) a depressive delusion that the self, part of the self, part of the body, other persons, or the whole world has ceased to exist. paranoid d's an older term for delusion of grandeur and delusion of persecution; its use is discouraged. delusion of persecution a delusion that one is being attacked, harassed, cheated, persecuted, or conspired against. It is one of the subtypes of delusional disorder.
Oto Catfish. These fish are perhaps the best kind of fish that you can get for the purposes of cleaning away algae from the plant matter in your fish tank. Their favorite type of algae to eat is brown algae, something that most other fish will stay away from.
Food and diet: The Naso Tangs are primarily herbivores. In the wild they feed mainly on leafy brown algae like Sargassum and Dictyota. Provide lots of algae, prepared frozen formulas containing algae or spirulina, and flakes. Japanese Nori or other seaweed can be adhered to the aquarium glass with a vegetable clip.