09-14-2011, 12:10 PM
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Having had an Oscar before, I did notice him laying on his side not looking good every once and a while. And my perimeters were exactly like yours. I honestly think it was the stress from the commute home, despite how short a trip it was. I find whenever I bring new fish home, they loose a lot of their color and usually regain within a couple hours.
Did you add some sort of water conditioner to the water as you added them? There's a product by API (Aquarium Pharmaceuticals) called Stress Coat, which contains aloe vera, which clams the fish down in such situations as transport.
Hope this helps.