Hi everyone! I'm about 6 months new to the saltwater aquarium world I have a 120 gallon tank currently I have 7 pieces of live rock, sand, about 9 hermit crabs, 5 green chromis, 1 clownfish, 1 orange spotted blenny, and my new baby as of yesterday 1 diamond back goby. I want to eventually get LED lights and buy coral... and with that being said is it necessary to have my skimmer hooked up yet? I bought along with everything else when I initially set up the tank. All of my levels have been great! No Nitrites or Nitrates etc. Also when should I buy snails or conch's? I don't have much growth so don't want to get buy and they don't have much to eat... but I did read you can supplement with seaweed I believe.