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.
What Do Octopus Eat. I had an octopus in an aquarium once. The answer is that it will eat anything that goes in the aquarium. I have seen it turn upside down, suckers out, and eat small brine shrimp. The shrimp are caught by individual suckers and then transported sucker by sucker to the mouth. If a fish goes in the aquarium, the octopus will send one of its tenticles (one of the two below its eyes) and catch the fish with just the tip. It will then play the fish like a fisherman quickly wearing it out and then it will grab it with all tenticles. They will eat hermit crabs in large shell. Nothing is safe. They are amazing.