Ok, so I lost 1 danio earlier this week (Monday), tonight another one is doing poorly. I have 5 Glowlight danios and 4 white zebra danios left. The White ones have red gills and some have sorta spots on them. My two honey gouramis have reddish areas by their gills but otherwise are fine. Behavior of the tank hasn't changed at all either.
On the other hand the Rainbows I have are fine. Another possible symptom of the one that has died and the other one that is not doing well is that they are THIN, really thin.
I have posted pics at Flickr since I didn't want to resize them so you can see every possible detail to help me in figuring this out.
It's a 29G moderate planted tank, temp is steady at 79, 0 Ammonia, 0 Nitirite, 0-5 Nitrates, Ph is 7.4.
Also, the danios have been used to cycle the tank (since 1/1/07) so I don't know if that plays into it at all. Flickr link