Labored Breathing after large WC?

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Alright, never got home for lunch but when I did get home earlier today some of the fish seemed to be doing better, however my male GT is still gasping. Everyone is still alive so that's good.

Here are the test results:

Tap Water
pH: 7.8 | NH3: 1.0ppm | NO2: 0.00ppm | NO3: 0.00ppm

Tank Water
pH: 8.0 | NH3: 0.00ppm | NO2: 0.00ppm | NO3: 0.00ppm

Alright, first off I would have thought the pH would have been flipped, I say that because I have 5 pieces of large Mopani driftwood in my tank and it seems all they are doing is releasing tannins.

So I'm thinking here - please please correct me if I'm wrong - that because of the NH3 in my tap water, doing that large of a water change is a big nono. Reason for that is because the larger the water change the longer my filters are offline and the fact that I'm replacing half the water with water that has that high of a NH3 reading verse when I'm only swapping out 20-30%. The fact that my tank readings are what they are now, indicates that my tank is healthy and fully cycled and not going through any mini cycles. So if I stay away from large water changes I should be fine...that sound about right?

Now, onto the matter at hand, the NH3 is no longer preset in my tank, I'm guessing that some of my fish - male GT being the main one, is still going through the stress/shock of that spike. Is there anything I can do to help him along or will it just take a few days for everything to calm once again?
 
My male GT looks like he's constipated as well, which isn't helping matters.

Could the stress/shock of the ammonia spike cause something like this?
 
Came home from lunch to check on him only to find him dead :(

Other fish seem to be fine, his female however is now hiding - she was out and about prior to him dying. They had spawned several times together and they were actually rather good parents and weren't super aggressive.

Gonna miss that fish :(

Haven't had a fish die on me in over a year...
 
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