120 tall... and tried twice in a slightly smaller tank.
Its tested and true, you WILL have problems, it WONT work and you will eventually loose every fish except for one. Unless you have thousands of gallons of space, they will eventually kill or permanently wound the others.
After a few weeks of chaos, I focused on one and have had that fish for around 12 years. Put one in the biggest tank you can, focus on water quality and filtration, high flow and a good diet if you are planning to grow it out.