bluemerle
Non-member
That's the problem with 55s no width and thin glass. I would venture myself as well, drill it and install an internal overflow box. Have the sump custom made it shouldn't cost much as long as you can fit it under the stand without having to remove the aquarium. The easiest route though would be to get the overflow/aqualifter combo and go from there. Its a straightforward approach column A or column B lol
The glass is a schoche under 1/4 thick, is that considered thin? I am deff not going to drill, I just can't risk it I can see it now. I'm going to try to go with the overflow etc.