I recommend that you get your hands on that 20g long since it would be easier to light than a 20g high. With the high, you would most likely have to place coral in the upper 2/3 of the tank depending on your lighting choice. Honestly, I got by easily with just a heater and 2 Hydor Koralia 1's for powerheads. Additional equipment is not needed, in fact, the less clutter you have in there, the better. Hope this helps.