10 gallon betta tank

Vincenia Vincenia lovely set up well done and they look great. I had a koi betta living next door in another tank to a female betta but i added paper on the side glass to stop any stress.
 
I used to do that when i had 5 gallons next to each other. Now I have tanks spread out instead of close together. I have a 7.5 gallon with a betta and a 20 long with a betta and other fish.
Really nice i just keep to my main tank now, when old age starts creeping up ones enough ?
 
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