Live Stock, I am still learning about live stock so bare with me but when you choice your live stock you need to make sure what living conditions it need. not everything is the same.
Sumps and
Refugiums, two items that are great but depending on your tank and setup you might not need. So figure out why you want/need one before you spend the money on it. while both are great and highly recomended, not every tank needs one.
LFS Water, When buying coral's and fish at the fish store never dump the bag into your tank, that little bit of water can mess your hole tank up..
