sl wrote in message . ..
have an oscar tank, my oldest had a cloudy spot on his side fin
for a while. today i noticed that it is spread to a nearby spot which
haas eaten through the fin. 2 other oscars have this cloudy spot on
their side (dorsal?) fins. but only there, and only three of 4 oscars
have it on one side only. checked water yesterday, and the nitrite
was .25, the ph 7.4 and all else at 0. i don't have a hardness
tester, but bein in the city, it's soft.

By "Cloudy Spot" do you mean mold (Grey, perhaps stringy, fuzzy)? I
have the feeling, given the information that you've supplied, that you
have a small tank that is overcrowded with 4 Oscars, and the "cloudy
spots" are injuries overgrown with mold. Grey mold often grows over
fresh injuries in aggressive aquariums. If this is not the case, then
tell us how old (i.e. what size) the Oscars are, the size of the
aquarium, whether it's aggressive or calm, etc --

--Mark