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Thank you for that comment. Currently, I'm testing water changes every 3-4 days since they're older now. I'll do the 30% instead of 50%50% water changes daily isn’t ideal. Honestly any of my fry have always done well when I’ve done water changes only if the ammonia in the water starts getting too high. Once weekly water changes of about 30% usually do the trick for me and keeps the water stable with less fluctuations. Sometimes water changes can throw off the good bacteria growth and cause the fish to die off because the fluctuations were too great. However (this is only what has worked for me) someone else might think differently.