Well casion , since you called into question my info
What I advised Skylar on was the knowledge that every fishkeeper is expected to know nowadays . Begginer to Oldtimer . Cycling aquarium water ,
Old hands had been doing it for years , without knowing why , It worked.
When I learned the principals of cycling, I found that fish have an easier time adapting to cycled water. ( I mean cycled water, old water, aged water,used water)Water that has adapted to turn fish waste into , nitrites, then nitrates.
I found from experts , pinned articles,, ( right here) that cycled water produces less shock. easier break in period, less stress, no or little new tank syndrome.
No one said " Except bettas"
When I decided to get back into bettas ,I applied the cycling plan to some ten gal, divided tanks with hang on back filters , covered and with heaters.
I did about the same thing I advised Skylar to do. Some old water , fresh water,I even squeezed an old filter pad into the water.
Got everything up and running , filters , temp, for about three weeks. Every now and then I would pour in a Qt of water from an established tank.
There was a slight rise in ammonia , not a spike , then averything leveled off with AM 0 , Nitrite 0 , nitrate 1-5.0 .
Put in the fish . After their three day trip , they never missed a beat . Next day they were flareing , building nest , active and heathy.
I've done three other tanks the same way , one still fishless , all healthy, clear/amber water ( almound leaf ). I don't see any bad info here. Proofs in the pudd'n.
Now if I had 250,000 , or even 250 jars facing me, I might see things different , but I don't . These are pets.
Now whether I'm filling a jar for the first time , or replacing water after cleaning , I have a choice. I can pour old cycled water into the betta jar , and replace the water in the large tank , with new water, or I can do it backwards . Pour the fresh new water on the fish. Then have to come back and clean the old water tank each week anyway,with weekly water changes.
If anyone sees this as bad advise, please dissregard it.
If you would rather buy the fish ,and jar at the same time then pour them all together, then sit them in a warm spot. Well I agree it does sound a lot easier.
Sorry for the long post.
PS
If Wuv keeps bettas in Texas w/o heaters, I bet a Lone Star, she uses a heated room , or closet.
Anyway
Happy bettas
KF