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Do these overflow boxes up a huge amount of space and 125 gallon aquarium I’ve never seen one personally. I’m worried I’m buying a big aquarium just to have it filled with two overflow boxes and have just as much space as I did before.if the glass is not tempered, I strongly recommend you drill for an overflow. Then you don't have to worry about the siphon failing like it could on a hang on back overflow, which could lead to your return pump overflowing the display.
If you drill, I can heartily recommend this overflow, I use the medium version on my frag builds: https://amzn.to/49J87Lo
If you can't drill because the glass is tempered, you could try this hang on back version from the same reputable manufacturer: https://topshelfaquatics.com/produc...8XuEvKluz7W7aq1JdPf6qDRScodVzBd0aApzBEALw_wcB
Two eshopps (pf800 IIRC) hob overflows on this 180g tank for 6 years. You can see them in the upper corners. Never lost syphon even when shutting return pump off. I would drill the tank if that is an option. The hobs worked well but I could never get them as quite as I would have liked.
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Drilling my tank scares me to deathMy hob overflows worked fine they we just louder than I would have liked but I got used to the noise.
Drilling isn't really hard just have to go slow and keep the drill wet. Probably some videos showing how. I drilled one and it went so well I bought some small drills and made holes in some wine bottles for my Gal so she could put lights inside for her one of her crafts. Most important is to verify the glass isn't tempered.
Good ideaI practiced first on some scraps and it was a used tank I already had so I didn't have a lot to loose lol.