Here's a list of stuff you need to get started!
It's only a 20 gallon tank
1. All you need is 1 or 2 big chunks of cured live rock (This will be your filter)
2. 15gallons of used saltwater from another persons saltwater tank on water change day
3. 5gallons of new saltwater
4. Salinity Hydrometer (very inacurate) to test salinity level, I perfer a refractometer
5. Heater at 78F-81F
6. 5 - 10% water change every week
Let this cycle for one month before adding anything to the tank, There is no need for a Skimmer on a 20 gallon tank unless it's fully stocked with corals and fish.
It's only a 20 gallon tank
1. All you need is 1 or 2 big chunks of cured live rock (This will be your filter)
2. 15gallons of used saltwater from another persons saltwater tank on water change day
3. 5gallons of new saltwater
4. Salinity Hydrometer (very inacurate) to test salinity level, I perfer a refractometer
5. Heater at 78F-81F
6. 5 - 10% water change every week
Let this cycle for one month before adding anything to the tank, There is no need for a Skimmer on a 20 gallon tank unless it's fully stocked with corals and fish.