If you are keeping in 1/2 gallon bowls, you need to be doing 100% change DAILY (same temp water) imo. I just dont see any way partial water changes every 3 days could be enough for a container that small.... and ditto what Violet said about chloramines.. if your county uses them, you need a remover that removes chloramines (and ammonia because removing chloramines produces ammonia) it wont just evaporate out.
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