Unless the water tests for ammonia it won't add it to the tank, Ammonia is caused by waste so hopefully you don't have it in your tap water. Now there could be other metals in the water that the stress coat doesn't remove which can cause problems. I would get a print out from your water company to find out what all is added in your water.

That doesn't look like mopani wood. But should be alright in the tank. If its grapevine it will rot a lot faster than most wood as its a softer wood.

If the bubbles are sitting on top of the water a few seconds before they pop I would say its caused by the stress coat as it has an oily feel to me and is probably coating the bubbles.

I wouldn't say the water changes killed the fish. Its one of the best ways to promote a healthy tank, even if you do them everyday. I have a tank that I do 50% on every couple of days and its one of the heathiest tanks I have.

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Water temp is stable: 78F
It looks like fish had different viruses ...

Now I may need to clean all this up (disinfect) some how.
Can I keep the plants? or virus will be caried over, in my new setup

And with all this, it's amazing how clean the water was...

Almost all tap water has chlorine and chloramines. When broken down chloramine turns into chlorine and ammonia. API's stresscoat can neutralize the chlorine from the tap but leaves ammonia. Normally doing water changes is the best thing for your tank, but by doing water changes with API you are essentially adding ammonia to your tank unless you use another method to remove it quickly like ammo-lock which API lists on their bottle to use together. With other conditioners like Prime this would not be an issue. ;)

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Stress Coat contains an aloe base and when the water evaporates from the tank and needs replenishing the aloe does not evaporate but remains in the tank. When you dose the refill water with more Stress Coat you are in effect making the concentration of aloe in the tank more concentrated. Since the aloe will not hurt the fish it is not going to kill them but will give the water a slimy feel and eventually the bubbles from any airstone or from the surface action of the water will make the aloe foam as if it were dish soap. It is not dangerous for the fish but Stress Coat needs to be left out of the refill water until a major water change is made and water with no Stress Coat is used to refill the tank causing the concentration of the aloe to drop to a reasonable level. Do not use Stress Coat in water to refill the tank unless it is to replace water in a major water change. Otherwise a non-aloe based product like Prime should be used to keep the bubbling at a minimum. It does foam and look terrible and can scare you to pieces I know I thought I had killed my fish somehow the time it happened to me. It just needs to be watered down with another type of conditioned water. Please don't put water that is not treated with a conditioner in your tank though.

Rose

It could be a mini-cycle problem, in which the tank was not cycled correctly when you first started it. Then again, you said you had it for 7 months.

This is what you should do:

Vaccuum the gravel every other day.
Remove 25% of the water.
Add stress coat.

I don't think that it could have been because of the driftwood. However, I have heard that some people put new driftwood in boiling water and then let it bake in the sun for 2-3 weeks, then boil it again. This ensures that all bacteria on the driftwood will die.

Also, what type of fish do you have in the tank? What are your ammonia levels and hardness levels.

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Thanks.

I can't vacuum gravel, I have plants. Specially it was very difficult for me to start them grow the way I want. I did keep the driftwood in boiling water, then in tap water for 2 weeks, just to eliminate the water coloring.

To be honest, the horrible smell is gone after series of WC.
There is some smell present there, but I think it's normal ... correct me if I am wrong ...

In tank I have:
Fancy Guppy - 5
Cory Peleatus - 3
Caridina japonica (algae eaters) - 2
Snail - 1