I got it! Cecil mentioned that he had found the 5D19 in the spring - so I tried my dealer again and Purina actually UPS'd 2 bags of 5D19 to the dealer. $34 a bag (2 bags) plus $60 freight. Expensive, but will be a fun experiment.
Trout are hoovering the stuff up. Don't know if it will actually effect the color of grown trout flesh, we'll see. The pellets are smaller than the 600 and it almost seems like they prefer it based on the eruption in the pond but maybe it's just more pellets per sq. foot).
