Thanks for the detailed response. Once I saw those clean welds, I had to ask. I will pick up a bottle of the 90-10 to weld the tray and tank. The welder I will be using is a Dimension 652 with a D74DX feeder. It seems to do well in the low range. I do not have the pulsed-mig capability, so I will go slow.
10ga is stout for sure! I just purchased 4 sheets of 12ga for the tray. This is my second try at it. I started it about a year ago and have learned alot through use. I want to be able to dump and fill quickly for a few reasons, check me if they are not really valid. First, I do not want to fish for parts, I want to dump and grab, then fill again quickly. Second, I do about50% oxy and need to be able to drop the water to about the bottom of the slats. The first design would not allow this very quick.