Thanks to Heath, progress has been made.

The guy I bought the unit from led me to believe all of the parts I needed  "came with".

He knew I was setting it up outdoors.

This unfortunate happenstance, has led to the slow progression and completion of my project.
The tank does not have a top that seals. Rain, bugs, leaves get to enter and inhabit the  reservoir.  Therefore I will have to buy a top "online", before this addition to my fish room is completed.