It does not matter to leave it or wipe it off. You will see all sorts of slime and algae on stuff over the years. Unless it is blue green algae (actually a bacteria) it is nothing to worry about.
Don't forget that the higher the pH, the more of any TA is in the NH3 form. Currently you have .0387 ppm based on " temp is 79 degrees. 1ppm ammonia 7.8PH " However, as if your TA rises or the pH goes higher, you should be doing a water change. Do between 1/3 and 1/2.
You have a little room on the NH3 level before you need to change water. As long as the fish seem fine, wait for Ammonia to go higher.
Just to confirm re nitrate. You do know that the #2 bottle has a tendency to settle out the some of the mix and it falls to the bottom of the bottle. So when doing a test you should be doing two things to the #2 bottle. You need to shake it like you are trying to make the solution come out of the bottle without removing the top.
Shake it well for a full minute. However, after about 20 seconds pause and bang the bottom of bottle on a hard surface and then resume shaking. Repeat this after another 20 seconds of shaking. Shake the first bottle, but just a normal shake. You do not need to go anywhere near as nuts with it.
Also. you do not need to test for nitrate every day. If you have 0 when you do test, then you can wait 2 or 3 days before you should test again.
Of all the tests you will use in your tank, the one for nitrate is the least accurate. Further, it is least accurate between 0 and 20 ppm.
Here are you basic guidelines:
- As long as your TA is 2 ppm or lower, you are fine in this respect.
- As long as the NH3 for any TA reading is under .05 ppm, you are fine in this respect.
- As long as you have 0 nitrite, your fish are safe from this and you are fine in this respect.
- As long as your fish are behaving normally and not showing any signs of stress, you are fine in this respect.
No matter what else is going on, your fish still need almost weekly water changes (every 10 days max.). If you are having to change water for ammonia, then you should not need more changes for normal maintenance reasons.
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DON'T PANIC