
i have a 10G heavily planted guppy tank that right now has 5 adults and about 15 fry (who are going back to the LFS if they make it through to adult size) and 5 ghost shrimp. (random numbers of pond snails sail in and out of visibility - hitch-hikers from plants, i'm sure, but i have no clue how many are in there)
a classic case of ich broke out awhile ago (about a week/week and a half ago) which i've been treating with anti-ich meds. there hasn't been any sign of ick spots on anyone for about 4 days, and then this morning when i turned on the lights i thought i saw new white spots on a few of the fry. when i looked closer, the spots looked more like fuzz patches. a few minutes later a fry swam up from the plants with fuzz all over its little body

i'm just looking for advise/suggestions as to
~ what this could be
~ if you can see a cause from the info i've given
~ if i can treat the whole tank - the filter strangely and suddenly broke in my QT tank so i'd rather not use it if i don't have to!
thanks for your time!