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One thing I've learned in this hobby is the more you worry, the more something may become a bigger deal than it is. The best way to avoid worrying is to do water changes. In small tanks, a 50% every few days is great! In large tanks I clean about 75% every few days. I don't use filters and I have a python siphon so it's easier for me. Just make sure you're doing water changes at least once a week in smaller tanks. The more, the better!
you should really do only 30% weekly to conserve the nitrogen cycle, the only time you should do more i a betta in a less than 3 gallon tank.
Aquarium Pharmeseuticals (API) makes something called quick start that you can use when doing larger changes, it contains nitrifying bacteria.