My god he's in a bad way can you isolate him, if the feelers have fallen off i don't think he will make it, as thats what they find food with, and he looks in a bad way, what size tank is it, how many fish and which type, plus water stats in ammonia,nitrite,nitrate,and ph.
That other fish in the pic looks unwell too, not the writer of this information below.
Ulcer Disease
Symptoms:
Fishes presenting with large red open lesions, ulcers or sores on the body have ulcer disease. Other symptoms may also include eroding flesh, reddening at the base of the fins and vent, and the fish may also experience a loss of appetite and darkening of color.
Cause:
Internal bacterial infection caused by Aeromonas and Pseudomonas. This disease is most often seen in fish that have been kept under poor conditions or recently imported.
Treatment:
Check your water conditions to ensure that they are within the optimal ranges for the type of fish you are keeping. If not, perform an immediate water change. Ulcer Disease is highly contagious, therefore the entire tank and all fish, even those not yet showing symptoms, should be treated. Treatment with Kanacyn, Furacyn, or Nitrofura-G are recommended.
Not the writer of this information below.
Epistylis (a.k.a. Red Sore Disease)
Symptoms:
Obvious symptoms include ulcers or cotton-like growths on the skin, scales and spine resulting in a red-colored lesion. Consequently, this disease is commonly known as "Red Sore Disease." In catfish the lesion will involve the spines and bones that underlie the skin of the head and pectoral girdle. This protozoan parasite has also been observed on eggs.
Cause:
The ciliated protozoan Heteropolaria. This disease is found primarily in wild populations of scaled fish. Heteropolaria is primarily a free-living protozoan that lives on aquatic plants and is believed to be an opportunist. Outbreaks are most common in catfish and salmon that have been kept for prolonged periods in water high in organic content.
Treatment:
These protozoans are osmotically sensitive and cannot withstand an increase in the salinity. You can treat your fish with a 30 minute bath of 22 g/L marine salt (non-iodized Sodium chloride) or a continuous bath of 6 g/L. Alternatively, you can treat with Quick Cure for 3 days.
/www.petsforum.com/cis-fishnet/afm/G29060.htm
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