I was going to send this as a PM - but might as well say it - Since I already gave my advice to the OP. 'cycling' a tank - is somewhat antiquated. Decades ago - there were no 'bacteria in a bottle'. There have been studies done elsewhere and here on R2R - which are fairly rigorous - that suggest it's fine to a degree. To this day - you can still get people suggesting - testing nitrite is important - others just as vigorously say it's not. etc etc - there are 10,000 protocols. If you asked 100 people here their actual definition of a cycle - you could get 50 different answers - and all would be correct.
I don't mean any offense to you - or
@Lavey29 it is my opinion - this issue is not related to ammonia - or cycling - its related to not quarantining fish. Ammonia toxicity (which I have seen multiple times on shipped fish) - usually resolves within a day or 2 - And Again IMHO - does not look like this. This again - to ME - looks like disease. IMHO - that should be the focus - since at a minimum - the values (again assuming valid test kits) - are in range, and non-toxic.