sudden pH drop, and cory cat sick

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Mindy2400

Aquarium Advice Apprentice
Joined
Jun 6, 2020
Messages
49
Location
South Carolina, United States
Soooo, my tank finally cycled, and today my cory Cat is on his side, and appears to be dying. Yesterday, my pH was around 7.4, and today it has dropped to 6?? The only thing I did was add some seachem flourish for the plants. Does anyone know what's going on, or how to help? Ammonia is 0, nitrites are 0, nitrates are 10, maybe 20? I have a 65 gallon tank, with 2 Angel's, 2 black mollies, 2 platinum guppies, and 1 rosy white finned tetra, and 1 cory cat
 
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