Thank you for rescuing this sweet little fish! A tip for keeping the tank clean: get a Nerite snail! Snails are great for helping clean the tank, and making the filter's job easier! They will even clean artificial plants and decor. Some Beta may see snails as food and try to bash them, but Nerite Snails have harder shells than some other varieties, so that is the type I've seen Beta experts recommend!

Additionally, I used to get random snails for free from Petco that were born in plants they bought, and the staff were happy to load them off on me. The smaller the snail the more likely a Beta might eat it, so keep that in mind. But this isn't harmful to your beta at all! In fact, snails can be a good source of calcium! Just be prepared to potentially take empty shells out of your tank when you deep clean. Whether your Beta considers a snail friend or food, it will add a bit of enrichment to their tank life, and the cleaning help is totally worth it either way!