![]() 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. It is a very efficient model of hang-on-back overflow box to go with. 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. The Tunze Hang on Back Aquarium Overflow Box comes with a flow rate of 320 gallons per hour. This will ensure vigorous water flow through the overflow system, thus preventing air bubbles from getting trapped in the siphon. ![]() In the end, the external overflow boxes are my favorite for their clean appearance from the front of the tank. Make sure the internal and external overflow boxes (especially the slots in the internal one), siphon tube, return pump and hose, etc. The guide comes on the better-made (more expensive) bits, and will roll along the edge of the overflow box as the excess material is trimmed off. 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. I have an empty Oceanic 37g cube (24" x 18" x 21") that I want to add an overflow to.
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