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.
1) Wanting to be fed. 2) Pooing. If you can see your fish through the glass then there is probably not enough algae to feed the algae eater. Even when they do eat your algae they still poo and contribute to the bioload on the tank. If you can find out exactly what kind of fish it is we could help with more advice.