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Hi Dinatwin, congrats on doing more research and getting your bettas in bigger tanks.
Each tank needs a filter and a heater. What test kit are you using? The API master kit is highly recommended. The strips aren't accurate.
If your showing any amount of ammonia, do 50% water changes daily until your readings are 0 for both ammonia and nitrites with some nitrates showing.
You can just add a couple drops of garlic juice to their water, it'll help their immune system. I use the minced garlic in a jar.
You can also feed him a few bits or soak his food in it, it should stimulate his appetite. Mine even likes to eat tiny pieces.
Use Prime as your water conditioner, it'll detoxify the ammonia for 24 hrs.
Take a stocking and run them over any decorations, it if snags, replace it, it can rip your bettas fins.
He could also use a cave to hide in to make him feel more secure
Once you get him into a heated tank, you'll probably start to see improvements.
I hope this helps. Good luck.
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