Sorry about the black neons. Hope you can find some healthy ones soon.
There's a LFS I go to occasionally but rarely buy from because I so often see them treating their tanks with ich medication. One day when I was in there they had some really nice looking cardinals and I considered buying them. They would sell them, but without their 7 day return guarantee, because they had just recently arrived and were in QT.
Point of the story is - if you take the sick fish, I have no doubt they would tell you that you do so at your own risk and there would be no free ich medication or discount involved :o)
Having said that, however, I have no doubt you could get them healthy because you are such a good fishkeeper.
30 g FW planted:corys, ABNP, blue angel, harleys, zebra danios, nerites & mystery snails
15 g FW planted: crown tail betta, neons, snails
90 g FW semi planted: Blood Parrots, severum, Jurupari, EBJD, congos, kribs, clown pleco, snails
90 Gal Journal: http://www.aquaticcommunity.com/aqua...ad.php?t=93939
Fishless cycling: http://www.aquaticcommunity.com/aqua...ead.php?t=5640
Cycling with fish: http://www.aquaticcommunity.com/aqua...ad.php?t=36492