apparently

Need to temporarily downsize my modest fishroom to make way for a nursery, as my wife and I have a baby boy on the way! (Names under consideration include Pseudotropheus, Eheim and L115.) For now, here's what I'm looking to sell-- 3 Aquaclear 50 HOB filters-- $15 each, or $40 for all three...

I got this 150 Gallon Tank for Free! What's the catch? Somebody perhaps had a great idea to cut a notch around 21-22" wide and two inches deep in the top edge of the aquarium. I am going to let people know what was already explained to me, and what my current ideas are to solve this problem...