Yep. Definitely cycling. I'm 99.99% sure it wasn't your fault at all. You may have had some bacterial dieoff during the process or the tank may not have been kept well before you got it. Water changes and testing will be your best friend.
Check this out if you haven't. It should help you through the process.
I just learned about cycling but I already have fish. What now?!
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8G Peacock Gudgeon, 75G CA/SA cichlids, 120G Planted, 50G Mixed Reef ( Build). 125G Reef and 100G frag tank in process.
Save the reefs... Buy captive raised when possible!
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