I think we are all responsible owners or we wouldn't be here on a board. We wouldn't ask questions, post pictures, etc.
I like the 2 gallon/2.5 gallon ones I get, at Walmart for 4.00. They are tall and wide. There is plenty of room for plants, small heater and plenty of air. I siphon daily, add IAL every water change, which is up to 3 times a week. My bettas aren't fed pellets or flakes, but get frozen or live food. So, I know they are happy. For my "picky" guy, he didn't seem to like his 2 gallon so, I gave him a 3 gallon, which looks like a giant brandy glass. He thrived and immediately loved the size but, heat-wise, it wasn't able to keep a sustainable temp. So, I ended up putting him a 2.5 gallon divided aquarium. That way, the temp was set but, he had the room he wanted in width.
As long as you are caring for your fish, as a loving owner, I think that is all that matters. Also, I have seen many bettas in tiny cups, waiting for sale. I think mine were ecstatic to get into a clean home, with plants and IAL, where natural light could come in (not direct) and still have a place that was clean and they are able to move around quite well.
I wanted to say that I think you are a great mom to your "kids". You sound like me. My bettas don't seem to be bothered with the filters I already have with baffling but I'm the one with the problem. Maybe, if it ain't broke, don't fix it. Trouble is I can't stop thinking and playing around on making the filters I have already set up pull in debris. I'm a maniac when it comes to keeping them clean.
Pretty ghetto, but it is fairly practical, I assure you .
Set this up real quick earlier this week with a spare heater, a dry food container that had a broken lid and a thermometer. Holds 1 gallon of water and with the plate lid (not airtight), temp is at 80-81. With a mesh covering, it is around 77-78. Planning on throwing in a silk plant in there once I can go to the store and buy a new one.
I figure it will act as a quarantine/observation enclosure for my next betta whenever one follows me home, or as a hospital tank should I ever need one.
For now, I just use it as a holding vessel with clean, warm and conditioned water for when I do partial changes. Nothing beats having water ready that is already treated and at temp.
Glad to know people are still loving this thread, I found a 2 gallon bowl BTW. Weighs a ton.... And, new fish (who I have been looking at for just under two weeks now... He is a metallic HMPK. First shows the green flecks in the light, the other more natural without the sheen.
I have 3 bettas, two are in the hanging betta cubes. One is in a 1 gallon vase. I was contemplating tanks at the pet store when the fish guy said the betta cube would be paradise compared to the cups they keep them in. Seemed logical to me. I did some research later and realized they got dirty too fast. So I do 100% water changes every other day with API stress coat, I let the water sit over night to come to temp as I couldn't safely heat the 1/2 gal. And doing my best to give them the best tiny homes possible. They are all active and healthy!
I don't have ANY betta of my own, but my stepsister has her female VT, Mystery, in a 2 gallon Aquascene. We always make sure the tank is clean, and she seems to be healthy and happy. I attached a pic of the tank and her swimming around.