Eel-proofing the overflow:
My DT has been running for about 4 month now, but I have been lax about covering the half of the tank that has the overflow. I had the internal overflow box on my tank shifted to the right half so that it is centered between the center brace and the right wall of the tank. I have since routed all the cables over the weir and out the top of that side of the tank.
I've been thinking about how to cover this effectively for a few weeks now, and this is what I came up with. Somewhat ironically, this is waht I was working on in the office yesterday when I had the carpet surfing incident.
I used some scrap polycarbonate I had to create a cap with wall that will fit just inside the weir for the overflow:
This will sit between the bracing of the tank allowing me to use a simple rectangular screen to tightly seal off the rest of the opening:
My return line loc-line and all the tank cables run through wide spots in the weir where the arches are in my cover. I think I am going to put a piece of mesh over my emergency overflow pipe as well. Even if the eel manages to get into the overflow, the only way out would be the emergency pipe. That would be bad though since the sump would be an easy place to escape.
I'm planning to 3D print some hold-downs that I can silicone to the bracing on either side of this cap to keep it from getting bumped out of position.