01-02-2010, 03:54 PM
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A follow-up on a couple of important points already mentioned.
First, I have learned the hard way not to buy fish that are newly-arrived in the store. This is especially important with sensitive fish--corydoras, pencilfish, hatchetfish, gouramis (thinking chocolate, sparkling, croaking here) and some of the more sensitive tetras. Many of these are wild-caught; the stress of capture, holding in their country of origin, shipping to NA, then released into store tanks that will certainly have different water parameters--all this is significant stress. It is no surprise that many fish in shipments perish by the time they get to the store or within a few days.
Also, if it is a reliable store with knowledgeable staff, they will recognize some diseases that we can't (not thinking simple things like ich, but more serious issues like columnaris, internal parasites, and protozoan which can all be very hard to eradicate) and I'd rather they dealt with these than my having to.
Second, fish that have been in the store for a week or two might not show any symptoms of ich, but get them home and it could break out. The point here is that the store's "quarantine" is not foolproof.