Betta Fish Care: Cleaning my Betta fish tank

Well now it has come time to clean out my bettas fish tank. Or at least
it is time for my wife to. I do think it must be done with great care.
I am not sure if it upsets the fish or not but I don’t want to freak him
out if I don’t have too.

We have previously set aside a one gallon jug of water. My wife filled
it up a few days ago and it is at the same room temp as the tank.
Also I believe that it has something to do with chlorine levels. I am
checking into that now. I would like to be able to check the levels
some how.

I took out everything and cleaned it with water only. Placed it all
back in the tank and filled with my aged water. The water temp felt
exactly the same so I put my little betta fish back in and he seems to be
very content swimming around his clean tank.

It seemed successful I guess. I don’t know how to tell if he is unhappy.
All I know is he is in a much larger place then before and is eating well.

Learning about betta fish care one day at a time