@Old Dog 59
it is interesting to watch my 4 (now 3) bettas in the different sized tanks. Tagawa has been in the 70 litre and the 200litre, and was happiest in the 70 - until I added a shoal of purple rasboras. They were too active for him and he took to the plant cover to avoid them. He is now doing exactly the same in the 200. So, for him, it seems less about tank size and more about peaceful tank mates. He also had problems with one cherry barb, but was fine with the other cherries and the black neons. i expect he would be very happy with ember tetras too, but anything zippier is too intimidating. In the 200 litre he is using maybe 1/4 of it, in 2 v heavily planted zones. He avoids the open spaces completely. i will move him into the 22 litre tomorrow, and see how his behaviour changes.
Kham on the other hand LOVES the 70litre. He had a small meltdown the day I moved him from the 57 to 70litres (possibly due to the hyperactive rasboras!). He bit off half his tail overnight, which was a shock for everyone! But then he calmed down, came out of hiding, and his tail is on the mend. He swims everywhere in a cool street cred kind of way, owning the entire tank, competes with the rasboras at dinner time, and ignores them the rest of the time.
No Name (Clint for short) is very happy indeed in the 57litre cube. He rules, he patrols, he ignores the ember tetras. All my tanks are heavily planted, so the plants are a constant. good shelter. good surface cover. Limited lines of site.
I'm moving towards seeing a 40-60 litre tank as being my personal ideal for bettas. I think that is around 10-15 US gallons? Obviously, other people feel differently, for their own perfectly valid reasons. But as far as I can see, plants, cover and peaceful tankmates are key to their comfort, and my
comfort improves when I see them in a bigger tank too... They can stay in a small corner, if they like, but so far no one has wanted to.
: (Kham) mature setup; betta, purple rasboras, amano and wood shrimp. Heavily planted.
22litre cube tank
: (Tagawa); betta, 1 amano, yellow dwarf shrimp. Pond snails and 1 assassin. Heavily planted.
57litre cube tank
: ember tetras, 2 amano, 1 nerite, pond snails, 1 assassin, doing his thing. Heavily planted.
; honey gourami, cherry barbs, green neons, otocinclus, nerites, pond snails, amano. Heavily planted.