These are a list of reasons:
- Want more room for corals and more fish
- Metal stand being used right now is 4' long
- Lighting is 4' long
- 75 Gallon seems like a sweet size I can be happy with for a while
- Want to match the 75 gal freshwater I am setting up soon
- Prob the biggest size without my GF noticing that I switched to a bigger tank
Sneaky sneaky!