Spontaneous accompanying fauna: snails
Suddenly snails?
Animals on newly purchased, emersed plants
How to handle accompanying fauna in potware
Parasites in your aquarium
Pests and their control methods
Leeches
Guidance on handling leeches in aquariums
Planarian flatworms
Detection and treatment of harmful flatworms
A plague of snails
Aquarium snails - good or bad?
Hydra
Hydra are often found in aquariums.
Aphids in your wabi-kusa
Natural pest control