Pleistophora (a.k.a. Neon Tetra Disease)
Symptoms:
Pleistophora is also called Neon Tetra Disease because of its high prevalence among Neon Tetras, although it has also been reported to infect most Characins, Cichlids, Cyprinids (i.e., danios), and all the carp-like fishes. It is characterized by a loss of coloration and pale, white patches of skin, particularly the strip of skin beneath the dorsal fin. Other symptoms may include spinal curvature, emaciation, fin deterioration and erratic swimming behavior.
Cause:
The microsporidian parasite Pleistophora hyphessobryconis. Pleistophora live in the muscle tissue of infected fish and cause degeneration and wasting of the muscle. The parasites travel through the fish’s blood, quickly spreading to all areas of the body. Pleistophora not only affect the fish’s muscles but all its internal organs.
Treatment:
There is no effective cure for this illness, partly due to the fact that by the time diagnosis is confirmed the fish is too weak to be saved. If more than one fish in your aquarium succumbs to this parasite, the entire aquarium should be emptied and dissinfected. Some aquarists suggest the use of a diatom filter to trap the spores of the parasite and thus clear them from the tank.
Pleistophora can easily be mistaken for False Neon Disease, which is a bacterial infection and presents with the exact same symptoms. For this reason, it would be wise to remove the infected fish to a hospital tank (while disinfecting the main tank) and treat them with a broad spectrum antibiotic.