salinity- 1.021
nitrate- 0
nitrite- 0
ammonia- 0- .25
pH- 8.0- 8.2
alkalinity- 3.5
calcium- 350mg/1
i need all the help i can get now. i do not have live rock. when should i get live rock? when should i get fish? when and what kind of CHEAP BUT STILL GOOD protein skimmer?