for @broadjay (the betta bowl ask) if you truly cannot get a tank for the fish (which I understand can be basically impossible for families that aren't willing to listen) then 1. do not put a heater in. I know that this sucks for the fish, but putting a heater into such a small amount of water causes the water temp to fluctuate and get way too hot. 2. Because the bowl is so small I would recommend doing a 30% water change every 2-3 days. Don't do a 100% unless you really need to because it 1/2
it can cause the fish to go into shock and die if it’s not properly acclaimed. If the water’s really dirty, which it can get in such a small space, you can do a 50%ish percent change. 3. Make sure to dechlorinate the new water you’re putting in! This is very important. If you don’t have access to a dechlorinator due to family or money reasons, fill a separate bowl with water and leave it to sit for a few days, that should do the trick. 4. When putting you fish back in, put your fish back in slowly, and do not add the new water all at once, spread it over a few minutes, this will help prevent shock. 5. as far as enrichment goes, if you can get a ping pong ball and a later pointer (like the ones made for cats) sterilize the ping pong ball in the dishwasher and let it float on top of your fish’s water. Move the later pointer around (outside of the bowl!!) so that your fish follows it. Both of these things are methods of enrichment and these methods of enrichment work because betas are predators and are also very curious!!! 6. If your family won’t let you get a tank due to money reasons, I know that Petco (petsmart? one of those) has a $1 per gallon sale once a year that can be very nice. 5 or 10 gallons would be good. 10 is better, of course, but 5 will do if your parents don’t want it to take up too much space. Also check craigslist for a betta bowl! Make sure that any decorations that are in your bettas bowl you can run along pantyhose without them ripping. If they rip the pantyhose, it’ll rip your fish’s fins. It will try to stay away from sharp things, but things happen and by staying away it will basically half the amount of room it has. Also! If your are somehow able to get a tank, longer is better than taller. Betta’s would rather swim side to side than up and down because it’s more natural for them. I hope all goes well.
A great submission about betta care re: the ask where the OP can’t convince family to upgrade their betta from a bowl.