Well, I've got bad news for you all... they all died around 2am yesterday... I don't believe it was from the water change itself, since they did not seem to react at all to the change and they died 12 hours later without showing the normal signs of stress. They ate their bbs dinner at around 7-8pm and looked pretty good. They were all active and looking around the new tank. I checked on them every hour on the hour and somewhere between 1am and 2am they just all died. I really can't explain it since they looked normal just an hour earlier but I NEED to find out why the fry keep dying.
I had been making water changes daily with tap water from the sink. The only thing I did different this time was I used water from the bath tub faucet (my 5 gal bucket doesn't fit in the sink) but I normally use the water from there for water changes on my other fish. The temps were all the same and the bbs was from the same batch they had been fed before the move so those weren't tainted. We have well water so I don't need to add anything but I added Stress Coat just in case. I had floated their container in the tank from 8 am to 2pm and added water from the tank to let them adjust throughout the 6 hour period-by the end it was 50% old water, 50% new water. I checked the temps before adding them and they were the same.
It is a 10 gal tank, 3/4 filled, with a full lid to trap humidity. The holes/spaces in the top are taped over as well. As I can see the humidity in the tank, that is not an issue. I have never had trouble with this set up in the past, but this is the first time spawning in this house.
This was the same tank that the first spawn died in though. They all died about 2-24 hours after they became free swimming. I had cleaned it thoroughly and soaked it in hot water after that incidence. I had also used water from the bath faucet that time.
3rd times the charm. I will spawn them in a different 10 gal tank, filled halfway with half of it separated off so Senshi doesn't tire out. I will only use tap water from the sink for all water changes.