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.
Pond snails dine on the algae in your pond. 7. Add tadpoles to your pond. Tadpoles not only eat algae but also eat mosquito and other insect larvae. 8. Feed your fish only as much food as can be eaten within about five minutes. Food not eaten will decay and contribute to algae growth.