Thanks StarDuster, the shelf was as easy as lifting it up and out. The shelf sits on four brackets that go into slots that are already cut into the cab. you can move the shelf to any height in the cab.
Here are recent pics, they grew taller than i wanted them to so i had to remove the shelf and move the light up other than that every things seems to be going ok.
ppm-1250
Ph-5.8 - 6.0
temp- 80/70
:cheertwo: