Pool sand as substrate?

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A little off topic, but I did a vacuum today of my river rocks and soaked the big plastic (all decor is fake) ornaments in removed water. I had the activated carbon out for a few days because I thought I saw white spot and I raised the temp and added mardel ich liquid drops (orange, smells like carrots). I soaked the activated carbon filter bag in discarded water.

As I was hanging out in my fish room, I noticed very fine fuzz on the large ornaments. I took one out, scrubbed with a toothbrush, but I don't think it did much.

Do you think changing the substrate plus removing the carbon plus the vac triggered a mini cycle? As of now, there does not seem to be any behavioral changes in fish.

Should I be concerned about the fuzz or let it run its course?
 
Am 0
N2 0
N3. 5-10
Ph 8.2
Temp 82 Fahrenheit

Don't remember if I said I put the carbon back in, but I did

The medicine was called parashield
 
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