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.
The otocinclus need to be constantly grazing on algae. There are types of algae that an otocinclus cannot eat for example blue algae is not suitable for the oto cat. Also algae that is hard and crusted onto the glass or other spots are not suitable for the oto. There are foods that can be substituted for the oto. Some of these foods being algae wafers.