I had to re-home my 4" long yellow coris wrasse as he was too big for my 30g.
If you don't mind me asking, what is restricting you to a 30g? Why not a 600g? Why not a 180g if you want to keep that shark for a short while?
If you don't mind me asking, what is restricting you to a 30g? Why not a 600g? Why not a 180g if you want to keep that shark for a short while?