Changing Water in Baby Tank

[Steph & Dave <caligula@curie.dialix.com.au>]

Hi Folks

I am having rotten luck keeping babies, of any sort, alive.  I have had
the same problem occur three times with krib's, rams' and bristlenose
pl*co's.  Any suggestions on what I'm doing wrong would be appreciated.

I have a small (5gal) tank that I set up and move babies into it (in the
case of the rams the eggs were moved) When I do a water change I siphon
out 10 - 20% of water and then fill from my main community tank, where
the babies come from in the first place.  Next morning, 12 hours later
1/2 or more of the babies are dead !!  In the case of the Kribs I lost
all of them within about 24 hours of the water change.

The water is heated in both tanks and would be no more than a degree
diff in temperature.

Any ideas appreciated, I'm finding it frustrating and disappointing and
dont like the idea of killing my babies from something I could avoid.

Thanks

Steph