Hi fishkeeper,
'looks like fungus'...could be columnaris, which is actually a bacterial infection, in which case I'd suggest Melafix...perhaps Pimafix as well if it seems to be further along or if it's near the mouth area.
True fungus only affects things in a state of decomposition....rotting food or a prev. injury.
where are the spots forming? anything else you could add....they still eating okay? any redness anywhere?
how's the water?
Also, the pleco mentioned in another thread...would u say the spot looks the same?...same tank?