Upon further review, it seems as though fry are more susceptible to all of the common aquarium diseases than their [presumedly healthy for this postulate to work] parents.
B Spirited - normally peaceful, but may chase slow species
H Hardy - tolerant to various water conditions and not commonly affected by hard to
treat diseases
K Subject to "Ich" - susceptible to the common, but very easily controlled parasite, Ich
Q Jumpers - tanks should be completely covered
Y Scavenger - will eat troublesome uneaten food particles that will otherwise cloud and
pollute water (at least two (2) scavengers/10 gal.)
I agree, Roland...always buy healthy fish...but...If you buy fish that are susceptible to ich, you may want to take extra precautions to keep them warm on the trip to your house from the LFS.
Yeah, I don't think that OTC meds are the greatest things ever, but some do work well.