Corner.... is it a curved front? Pics always help!
For what it’s worth, I started with a used Fish-only, live rock 46g bowfront that had a canister filter. I upgraded the light and flow on it and tried out some corals. I moved all the rocks from it to a 75g non-drilled with a hang on back overflow, and a DIY 30g sump that came with a bunch of rocks and some coral that miraculously made it. I set up a Nano, because my Anemone liked to wander and BELIEVE ME..... there is no Nem proof powerhead covers for a determined nem. I am currently waiting for my next tank to be built..... 8’ long shallow acrylic beauty.......
That will be my 4th tank, for a guy who never had a tank in their life, in less than 6 months........
If I were you...... sell the corner tank now, decide what big-beautiful tank you want (You will be asking about Tangs before you know it..... just start looking for that nice 150 on Craigslist now....) and save yourself a lot of time/money/headaches.......