So does anyone have an opinion on this kind of overflow? My tank is only 24" long, and it seems that it's only larger tanks that cracked, but I'm still worried because my tank is 18" front-to-back, with no brace. Here is what I have learned about making External Overflow boxes safe but I need some oversight: 1) Drill holes in your display tank return nozzle just under the waterline to prevent any back siphon from the display tank back into the sump through the display tank return nozzle should the return pump die. ![]() I've read Tunjee's thread ( ) on RC in which he did the same thing, but then later in the thread, others chimed in and reported that their tanks cracked/broke after installing the overflow box and running it for awhile. In the end, the external overflow boxes are my favorite for their clean appearance from the front of the tank. utmcampaignEL+7C+ACQProspectingShopping+7C+ROAS+7C+All+Products&utmsourcea. Grab the 1 1/4 inch PVC coupling and attach it to the reducer bushing. RitchieKy Reef Aquarium Discussion Replies 3 Views 337. Do It Yourself (DIY) Replies 6 Views 177. ![]() I also plan to cut two smaller holes for return lines. Working our way up the standpipe, it is time to connect the 1-inch reducer bushing. I would of course support the external overflow box so the extended weight does not cause any problems. Next, attach the 1-inch connector of PVC to the male adaptor. I've considered several designs - classic internal overflow box, overflow box running the full length of the tank along the back wall, and external overflow box added to the back exterior of the tank. Install the 1 inch PVC male adaptor to the bulkhead at the bottom of your overflow system. They are made from 6mm (.235') cell cast acrylic and very strong. ![]() The external box is 21' long, 5.75' wide, and 7.5' tall. The internal box is around 42' long, 2' wide, and 7.5' tall. I have an empty Oceanic 37g cube (24" x 18" x 21") that I want to add an overflow to. I bought 2 sheets of acrylic to build myself an overflow box, so to help fund my current build, I used the extra acrylic to build two more identical boxes to sale.
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