Belly sliders

[IDMiamiBob@aol.com]

I decided to separate the last clutch of A. cucatoides from their mother, as
she was in a community tank.  I set up a ten gallon tank and matched
temperature, pH, and hardnessto the source tank. I then transfered the fry by
picking up the flowerpot they were in and moving the whole lot at once.  They
have been eating for a week now, and tend to lie and slide aroound on the
bottom, swimming up for only very brief periods of time.  I guess this is
what they call "belly sliders".  Any idea what may have caused this
condition?  This is the first time I have set them up without using at least
50% of the fry tanks water from the source tank, and the first time I have
seen this problem.  I thought I was doing them a favor by using completely
fresh water.  Any suggestions would be appreciated  Thanks

Bob