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Hello, quick question for help. I have two Lesser Salmon Catfish (Arius graeffei) from Australia. They are in a 200L tank with two tiger red oscars and two eastern long necked turtles. The cats have developed a small number of large (1 - 2mm) white spots on their fins, about 3 in total for each fish. I don't believe this to be ICH due to the small number and large size of the spots. I initally felt that it was most likely fungus due to the fact the turtles had a previous fungus problem that was rectified before the cats were purchased. I have treated the tank with salt and anti-fungal treatment with no result. All members of the tank appear quite healthy and the cats show no outward problems with a healthy appetite. The cats are about 10cm in lengh, and quite young, given their mature size. I don't believe that they develop spots as they age, as I have seen fully grown fish without spots. Any help would be appreciated.

Possible the Oscars are nipping at them during feeding time or in gerenal. I know Oscars are known for being one of the most aggressive from the Chicilid family.

I have been asking at a few aquariums and it appears that the most likely answer is that it is ICH. But as I have good water quality and and a good tank setup for the fish, they are able to resist any further attacks. Leaving only the initial few parasites that were present when I purchased the fish. They suggest that I monitor the fish as they may be able to get rid of the ICH themselves, and as it has not spread in the tank, the other fish are capable of repelling it also. I'll monitor things closely and if it appears to be spreading take immediate action.