Hopefully this link is visible. It is a 3d sketch for a new tank (minus the sump) that I'm thinking about building.
Use your mouse wheel to zoom, and right mouse button to change viewing angle.
The tank measures 140x140x40cm. In the middle of the tank I have an overflow box, and water is returned to an adjacent chamber.
The two yellow pipes in the overflow box are a herbie overflow.
The black pipe in the adjacent box is the return.
To promote water circulation the overflow takes in water from the bottom half of the tank (where the fish crap is) through a grill, then up over a baffle. I'll call this the baffle guard. I may also allow some water to come in over the top of the guard to act as a skimmer. On the return side, the water goes over a baffle to prevent back siphoning if the sump return pump dies. What flow rate will I need on my return pump to ensure sufficient circulation?
I would like water in my tank to be filled right to the brim (important). To ensure this I think I will need to tinker with the height of the overflow baffle. My idea is to add some lines of silicon on the top of the baffle. Thoughts?
Not shown will be a round plug on the same baffle, but 2cm lower. Opening this plug will cause the water to flow through the hole on its way to the sump, bypassing the top of the baffle. The effect will be that tank water height will drop 2cm, which will be useful when performing maintenance. I may make this plug adjustable to allow for a range of different heights.
The return side also houses a light blue tube with is my RO water source. I intend to do automatic changes / topoffs. RO water will be pushed out here on demand. The sump will have an overflow to a drain.
I plan to be able to begin a water change by turning a tap, then turning it off a couple of hours later.
The central boxes will be surrounded by rocks that will form a mountain. The mountain will stick out a further 20 - 25cm from the water. The green box + tube in the return box is a small pump. It will push water up to the top of the rock mountains via 1 or more tubes, so that I can grow emmersed moss on the rocks. I plan to run a wire down the herbie emergency drain to power this pump. During maintenance I also plan to drop a gravel vacuum siphon hose down the emergency drain so that I can vacuum the tank without lifting a bucket.
The sump will contain my c02 reactor and chiller, so the main tank will be completely free of equipment, and viewable from 360 degrees, and from above. No decision yet on what plants or animals will grow in there, but there will be shrimp. Since the tank will also be viewed from above, the lighting will need to be suspended about 1 meter above the water, so I may need some powerful leds, without cooking my emmersed moss.
Thanks to anyone that read this far
Please share any insights on what could go wrong , and flaws in my ideas. This creation is still at the thought bubble stage, but once I get a new (larger) place I would like to build something stunning. The priorities here are 1) looks (no visible equipment), and 2) ease of maintenance (never lift a bucket).