ATO for 8 gal?
1. Circulation,
2. sufficient lighting,
3. filtration,
4. heater
5. testing kit and thermometer
6. RODI or Premixed SW
7. Proper Cycling and lots of patience...Oh and patience...Don't forget patience. Can't over stress patience.
Good luck and Welcome. All you need to know can be found here and if you have a LFS, use their knowledge. My suggestion is don't overspend on the exotic equipment and fancy products until you are established and sure your staying with this effort. AND, make sure that of the above list, you don't be afraid to buy the highest recommended products. any of them malfunctioning will KILL.