Are my water parameters allright?

[Kicker]

Hey guys, I bought a used 12g Nanocube off a guy on craigslist and to be honest I wasnt fully prepared for SW. I know my stuff from planted freshwater really well so I didnt think it was that bad. After A week I thought it was pretty easy. I did a 50% w/c with RO water and tested my water. There was no livestock when I bought it except for a few crabs, snails, and ofcourse liverock and sand. I had 0.5ppm of Phosphates and 5ppm of Nitrates. Currently im acclimating a clown that yvr sold me. I want to start slowly adding some softies and zoos but want to know what are the safe params, and if this is too high how do I lower them. I plan to make a fuge in the middle compartment with some chaeto and a PC clip on. Any advice? Thanks