I did it!!!

Omg I'm so proud of myself. I know, dorky, but I'm shy with people, especially when I telling people that they are doing things wrong.
So I talked to the mom, and it turns out its a tad worse than I thought. They get their water changed every 1-2 weeks, and no water conditioner! My god..how are these things still alive and making bubblenests? I wish Orchard was like that lol.
I was right, they are in 1/4 gallon tanks. The son tried to tell me bettas were supposed to live in little containers GRRR! So I told them that with a container that small, they will need to be doing water changes at least every other day to keep ammonia down. I suggested the cheapest and best thing for them was to buy a 10 gal tank from walmart and a divider and keep each on either side, with the water level at least three inches below the divider and some plants/decorations along the wall of the divider. I could only guess since I've never kept bettas in those conditions, but I said that this way they would probably only need water changes once a week. Is that right? I'm gonna make them a caresheet and bring them the leftovers of my cheapie conditioner to start them off. The woman said they have a lot of animals, so the fish don't get taken care of. I had to resist telling she shouldn't have bought them...of course they are planning on getting the little girl a hamster soon too. That is too many animals, even for myself. If you are going to have two cats, a dog, a bird, two fish, a hermit crab and a hamster, you better be taking good care of all of them.
Thanks for the help everyone

Can some one direct me to some good care sheets and info on different kinds of rot?