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  1. Sudden ammonia spike in established tank?

    Beginner Freshwater Aquarium
    My fifty gallon has had a change of up to .50 in just about two days! The first day, I did 40% w/c and te second day I did a 50% the next day. Always use decholrinator, my water is soft, these are my fish as of right now are nine guppies, fry of all ages, five cherry barbs [more in qt to join...
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