I believe that's about 250 gal?
However, that seems suitable for most of not all sneakheads.
Biggest sub-tropical would be barca, I believe those sizes are just fine for one.
Biggest trop would be micropeltes, which is much less expensive and much more readily available.
Not many people keep micros long term, it is hard to say if it would outgrow this tank, but I don't believe it would. For a safer choice, Diplogrammas are smaller micropeltes, but with much better colors (though that may be subjective
).