So I recently got an established 75 gallon tank with 20 gallon sump/fuge from a guy on Craigslist. It came with a purple pseudochromis he's doing really well and he is constantly hunting for pods
. I have been testing the water and everything looks good. 0 ammonia, 0 nitrites, 5 nitrates, and 8.0 ph. I have been adding buffer to get the ph up a bit. So now I'm going to buy my first fish
. I was thinking of getting a foxface or a yellow tang. Which one would typically be more hardy, and are these OK choices?