molly fry dying

Question
Hi,
I have change the all water of the fry before 5 days. i think they didn't like it. but after 2 days they are fine. ( after your advise i do as you say and they are little bit large than before i can see their growth.)tomorrow one fry died at afternoon and another died today(their eye's are open). i have moved the fry in small glass which is transparent.(filled with new water)
what is the reason my fry are dying?
what can i do now.

Answer
Tho only other thing I can think of is the water is not good, nor is it arm enough. Fry are very delicate for the first few moths and changing all the water at one time can send them into shock. The water temperature has to be consistent with no fluctuations at all. When you clean their water, only remove 25% of the water replacing it with clean conditioned water. Make sure the new water's temperature is the same as the water they are swimming in. Fry are very hard to keep alive if they water is not perfect at all times.