[Ebichua]

I have never experienced any problems with switching dechlors.

However, I'd like to know how fast you refill that water up in your tank. I used to refill the water into my tank using a python really fast, which in turn, caused me to lose quite a lot of shrimp. When I was telling a friend about it, who is a successful shrimp keeper, he explained to me that I needed to refill the water very slowly. Say... the water refills should take 10-20 minutes long (just to refill!!).
I've been doing this ever since and have not lost any shrimp from WCs

 

[Ebichua]

Take 20 minutes if it's going to be 25-30 gallons.

I only take out about 10-15 gallons out of my 40breeder and I take about 20-25 minutes to fill it in. Just make sure to keep checking every 5-10 minutes to see if it's full yet. One time, I decided to play a game and forgot about my tank filling up until I heard splashing... It was pretty bad, since I had tank water on the floor. But the good news is, I didn't lose anything