Now it was time for the star of the new system! My prop tank. I never heard of anyone doing a propagation tank on a 29g before, so Marc and I really pushed to make this one creative with the small space we had to work with.
We through a bunch of ideas back and forth and I really wanted an infinity prop tank. So Marc and I came up with a way to do it with a "drip tray". The issue is it was way too cool an idea to just hide in a stand, hence the window in the door of the stand.
The key to a good infinity tank is the flow and keeping it level. The middle shelf in the stand was built to hold the whole tray. The flow would come from the T-ed off return line of my Mag7. A gate valve would be added to control the flow going into the prop section.
It would be lit by a 65 watt power compact 50/50 bulb (50% actinic and 50% daylight).
I wish I had a million more pictures of the construction of this thing but it was extremely late at night before we got to this step and I was literally passing out on the carpet as Marc finished gluing the drip tray.
The most important piece to the entire infinity prop tank is the drip tray seen here.
The back of the drip tray is very high and will rest against the back of the stand. The shelf will hold up everything and the bulkhead in the bottom is what sticks through the giant hole in the middle of the shelf that you saw earlier. I screwed a piece of spa flex tubing to the bulkhead and led it to the refugium as you will see later. The front of the drip tray is made with a thin piece of black acrylic so that you can't see the water flow underneath to give the illusion that it's just disappearing.
It was important to be able to remove the prop tank from the drip tray to clean underneath. For this reason the legs are attached to the top of the drip tray to lift the tank up and allow water to flow freely to the bulkhead underneath. The tank simply rests on the legs and can just be lifted out to clean under.
The prop tank itself is just a simple box that is about 1/4" shorter on all sides that the drip tray. The back and sides at the top are 1/2" taller than the front of the tank. As it fills the water will continue to overflow off the front of the prop tank. It will go in the 1/4" space between the drip tray and the prop tank and underneath. It will go to the bulkhead and drain down the spa flex.
Here you can see the sump that was slid in from the back of the stand and the prop tank. The left side of the sump is the skimmer section with the drain line's bubble tower in the back. The middle is the refugium and the right side is the return section.