Quarantine Tanks Are Preferred
Methylene blue is generally recommended as a bath or dip treatment -- don't put it directly to your aquarium unless your vet advises to do so. It is a powerful phytotoxin, which means it attacks most types of bacteria and other micro-organisms indiscriminately, even the beneficial ones. This is a primary reason why dosing the aquarium instead of a quarantine tank is a risk. The chemical is true to its name: It will stain the inside of your tank. Move your fish to a temporary holding tank before conducting bath or dip treatments.
Methylene blue is generally recommended as a bath or dip treatment -- don't put it directly to your aquarium unless your vet advises to do so. It is a powerful phytotoxin, which means it attacks most types of bacteria and other micro-organisms indiscriminately, even the beneficial ones. This is a primary reason why dosing the aquarium instead of a quarantine tank is a risk. The chemical is true to its name: It will stain the inside of your tank. Move your fish to a temporary holding tank before conducting bath or dip treatments.