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2 50%s You'd technically be doing a 75% water change over all (50% of the old water the first time, then 25% of the new water and 25% of the old water the second time). Doing two separate changes gets rid of most of the old water, but keeps the water levels relatively high so the fish don't hit...

Oh boy. I'm brand new to the forums, and already full of issues. I've had more bettas than I can possibly count, often spending more on betta medications than on my own food as I would purposely rescue ill ones that no one else knew how to handle. I've had only one mixed tank prior to my current...