I am absolutely green with envy of your shrimp motels ...
amber2461
Thank You for the Kind Words.
Here are a few more pictures of a little progress.

The 3 Tanks on the bottom row now have their overflow/drains plumbed together.

As you can see " White Bucket ", the Drain line is not yet connect to the Sewer Line. Hopefully this coming weekend.
The ( 2 ) Black 90 degree elbows are for future use. Gravel Vacuum.
A few helpful hints, if you are thinking of constructing your own Rack System.
( 1 ) Use Unions to easily disconnect a Tank from the System. ( Second Picture / Top Center )
( 2 ) Use Silicone instead of PVC Cement when possible. This makes it possible to make correction if a mistake is made.
Since the Silicone will take longer to Dry/Cure. Your project will take a little longer , but you can take parts apart if needed.
Future additions will be:
Water Change / Evaporation Top Off via Lawn Sprinkler Timer & Drip Emitters.

I prefer the 1 gallon per hour. With it still snowing here, selection is limited.
Using multiple Emitters In-Line or Reducing the Supply Pressure, you can really lower the Water per Hour / Day into your tanks.
Lighting will be 3000K or higher Par20 Mini LED Spot Lights.

The Par20 in a Mini Version of this Par30.
Total height of the Light is only 2".
Depending on the Angle/Spread of the Light, I may be able to get away with only 2 lights per 3 tanks.

Here is my Sponge Filter w/PVC Evaporation Control in action.
End Caps still need to be added & Water Height needs to be adjusted.

With Multiple Tanks, Evaporation / Humidity will be a problem.
Glass Tops will help limit the Evaporation/Humidity Issues.
Glass Tops with Condensation will limit the Light Penetration, if you are trying to grow plants.
I have a Bathroom Exhaust Fan installed to remove Humidity in my basement. But, using the fan also removes Heat.

Another issue with a Multiple Tank Set-Up is:
Even Distribution of Air to the Sponge Filters.
I also use the Water Drip Emitters on my Air Supply Lines.
With Limiting the Air-Flow to each Sponge Filter, the Depth of the Rigid Air Line needs to be uniform between Tanks.
The Black Plastic Piece ( See Picture Above ) is used to adjust Depth. This piece is a Toilet adjusting Piece.
The Rigid Air Line is used because it is easier to Clean, when needed.
A easy fix for Air-Flow with multiple tanks is:
Blower - High Electric Use & Noisy.
Linear Air Pump - A little Costly, but very efficient on electricity.
I hope to get a little more progress completed this coming weekend.
I was held up this weekend with helping out a friend.
He was running out of tanks space, so I am baby sitting her for awhile

She is a 2 month old Marble Matorro with a 5" Disc.
Not to worry, She is no where near any Shrimp