Hi Cyan
Firstly, a white spot or two appearing on the wen from time to time is perfectly normal and nothing to worry about. It isn't a symptom of disease; it is just a sign of wen growth and will not hurt the fish. No need to treat with anything.

Second, ich and whitespot are just different names for the same disease (whitespot is the UK name for it).

I recommend treating this with a 0.3% salt solution and increasing the tank temp to around 78F (not that you need to treat if there is only one spot on the wen).
Finally, you are adding too many products when you do your water changes, which is not a good idea for several reasons. Stress coat contains aloe-vera, which can clog the gills if you use too much of it; it is also unnecessary if you are already using a water conditioner as it does exactly the same job. Accu-clear also does nothing to help the aquarium; try doing without it and I promise you there will be no noticeable change in the clarity of your water. Salt is not beneficial if added regularly in very small amounts; it only becomes effective at 0.3% or above as a specific treatment for disease or water-quality issues. If you add it all the time in small amounts then any organisms in the tank may become resistant to it and then it will not be as effective when you really need it to work. There is also no need to use ammo-chips if you are doing water changes regularly. The natural cycle of the tank should be more than enough to take care of any ammonia. In fact, ammo-chips are dangerous because if you ever DO get a water quality problem, you will not get a true ammonia reading from the test kit and may not spot the problem until it has become very serious.
I would strongly advise you just to use a good tap water conditioner and nothing else in your weekly changes. This is better for your fish than using several different unnessary chemicals to try and keep the water sparkling - honest!

Do not make your changes more than 50% and do not scrub out your filter sponges every week; you'll just affect the cycle by doing that (you should only gently rinse out the sponges in old tank water once every couple of weeks at most).
Hope this helps.

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