Popeye, I am not sure with your setup so I cannot comment too much about what you should do.
However I recently had a number of trouts die on me, floaters and sinkers, for what seemed like no apparent reason. Water tests were all fine, there were some ammonia but not in quantities to be alarmed about. In short, I believe by the time the water tests indicate a problem to you, your fishes will all be dead. I think especially for trout.
Do what Rupe suggested. Drag a net at the bottom of the tank slowly, and check for uneaten food. If you find some, do the whole tank and remove all the uneaten food. Slowly though, do not want to stress the trout anymore. Based on my short experience in AP and trout, they are very fast feeders. If they left something behind, they are not themselves.
By the way, I believe that uneaten food was the cause of my disaster. And like some suggest, the trout cannot see the pellets, hence they do not feed. For this reason, I have left (dumped) my water level in the fish tank such that at when the growbeds are fully flooded (ie. water in fish tank has dropped due to flooding of growbeds), I can see the bottom of the fish tank. I do my feeding then as well. Less water depth (or height), more clarity for the trouts. At the same time, I look around for sinkers. Sinkers are as bad as uneaten food, if not worse.
Not sure about your setup, and I would not advise you to do the same, but I would just like to share that, this is what I am doing to be able to see more clearly what is happening below the cloudy abyss.
Like others suggest, the trouts are still new. Test a few pellets before throwing in the whole feed. Else starve them for a day or two, then feed them. If they are hungry, they tend to snatch for food at the surface.
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