like the title suggest, what fish would fit best in a fantasy themed tank? My son, after seeing my tank, wants to set one up too. His design. He wants the whole castles and dragons type fantasy tank. Maybe a hilly scene with a castle...or a 3d background that resembles a medieval castle wall. The tank he has is a 29 gallon / 110 liter tank. 30 x 12 x 18in (76 x 30 x 46cm)