hi mike,
I also have fan tail guppies 2 neons and last week the famale gave birth to 8 fry. I added water to the aquarium which is bottled water only to find she was not doing well. To make a long story short I had my water tested and the ph was high and was burning her, she seemed to improve but then later found her dead stuck on the filtering system, however the others seemed to be fine and the male fan tail also stays at the top of the tank.. I asked a question a while back about white fuzzy slimy stuff floating in the tank. I was told that over feeding may be the cause so i feed once aday but the white fuzzys are still present it seems to not be as visible now is it some thing more. I have a bubble rock as well can some one help w/ this myster???? shark