Hmm.
Water from the supermarket is not to be trusted, who knows how often the filters are serviced and does that servicing match usage. Remember the kid replacing the filters is getting a little better than minimum wage and would rather be chatting up the florists than messing with wet filters.
I get my water from a small local company that does nothing but fill water bottles for drinking. I asked and dude gave a full tour of his industrial Culligan filters and showed me his log book including TDS in and TDS out.
I have never had Hair or Cyano in my 12 Gallon and I think the water has a lot to do with it.
Ammonia with no nitrate or nitrates to me means your cycle is messed up. I would stop all dosing of "Bacteria in a Bottle" and let your tank sort it self out naturally, think of it as a mini-cycle.
What is in your HOB filter? If it is a sponge make sure it is switched out with a clean one at least twice a week. I use filter floss instead, much easier. If your sponge ever starts to smell "fishy" then it has been in there too long and needs swapping out with a fresh one.
Confirm all test results with another reefer or LFS
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