If your tank will be 1-3.5 or even larger you don't have to cycle it, meaning that you don't need the heater.
You can do either full water changes or you can do 2-50% and 1-full water change. It what is more convenient for you. But if you can, go with 3 or 2.5 rather than one gall tank.
You need to acclimate the fish to the new water so you don't stress them with the water temp difference . I personally like to age the water for my tanks. If you age the water (STILL HAVE TO PUT WATER CONDITIONER,before aging or after) , so when you aging it for about 24 hrs then the new water is the same temp as his water and you don't have to worry about temperature thing.
I do it in the summer when i take heaters out from all my tanks , as we have hot summer here.
I also like to say to quarantine any new fish always, and do not share anything between your new fish and other fish in case new fish is sick. And sometimes you don't even see any symptoms that can develop later on. So i think it very important.
I don't know i do full water changes for all my tanks and never had any problems with that. All my bettas live long lives . So i don't know why people thinking that you stressing them out with a water change. Yes a few of them get mad in the changing cups but never saw any stress lines or any other symptoms. I have betta that is 5 years old and the youngest about i think 2.2 . And i have 10 of them.
I think you can have 2 bettas in the same tank, feed the same , change water the same and those betta will have different life length
1. can have betta in the changing cup with about 15% of the water and keep adding small amount of the new water about every 5 min for about 5-6 times -this way you he will get used to the temperature:)
2. Note the temperature of the water.
Using a plastic cup, scoop him, along with some of his water, into the cup.
Clean out the tank. Refill with water at the SAME temp. Be sure to add the correct amount of water conditioner.
Float his cup in the tank for about 15 min. (Study during this time. If he sits longer, it's OK.)
Add a SMALL amount of NEW water to the cup. (Several tablespoons, or about 1.5 ounces.)
Let his cup float for about 10 min. (Study during this time. If he sits longer, it's OK.)
If the cup starts to fill too much, remove a SMALL amount of water from the cup. Discard it.
Repeat steps 5-7, until about an hour has passed. (If he sits longer because you're studying, that's OK.)
Gently release him into the tank.
3. To do a water change, use a little cup like a plastic solo cup - this cup must be only for him and have never been used with soap or other chems. Scoop him up in this cup (keep him in the cup about 1/4 full of water - it doesn't need to be much because he won't be in it for long) and leave him in the cup while you change his water. To do the 50% use a turkey baster - dedicated only to him that has never seen soap or chems - and drag it through the gravel and try to suck as much of the poop out as possible, in addition to 50% of the water. Use a thermometer under the running tap to get it to be the same temp as the water that is normally in his tank. When the thermometer says the flowing tap is the right temp, fill back up his tank. At this point, add the conditioner (dose for how much water you change - if you change half the water you add half gallon worth of conditioner, If you do a 100% water change dose for the full gallon change). Float his plastic cup with him in it in the new water. Slowly add a couple tablespoons of the new water into his cup every 10 minutes for at least an hour. Finally, dump him in gently but try to get as little of the old cup water back into the tank as possible. When you do the weekly 100% you will do mostly the same thing except empty his tank fully and rinse everything in it very well under warm water but never use soaps or chemicals. Once it's fully cleaned/rinsed you can refill it and repeat the cup/acclimate phase.
4. When I change the water I put him in the cup I got him in then I take everything out of the tank, rinse everything with warm tap water. Then I put everything back in the tank, fill it with dechlorinated new water, and then turn the heater on. When the tank water is the same as the cup water , then take the dirty cup water out and a little at a time and put clean tank water in the cup. After that I put the cup in the tank and he swims out.
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You don't have to do it if it not convenient for you .You can just acclimate him the way i posted in my last post. But 10 L its about 2.5 gall. I am using just two - 1 gall jugs from the spring water. I fill up the tank with 2 gall of the water, put betta in the tank. Then whatever more left to add, i just premix new water(without aging it), add water conditioner and slowly pour it in the tank.
I have read not to introduce shop water with tank water ,
I place the betta and bag in tank for 10-15min
put my tank water into new tank and then after he has come out of quarantine put him into other tank water
Oh you are from Portugal how cool!!! Not sure about shipments may be other people can give you good advice. But i know that you can find reputable breeder on this forum who might help you better. Do you want me to try to ask a few people on the forum to help you?
Non of the stores near you carry bettas at all? May be they waiting for the new shipment?