I agree with abulgin, next to LR a protein skimmer IMO is 1 of the most important pieces of equipment you can invest in, for a reef tank I would consider it a necessity, I'm not sure I would go with a "if it ain't broke don'ty fix it" philosophy in this hobby but that's just me........what is in your tank in terms of livestock? What is your regular H20 change regimen? Are your H20 parameters stable? A protein skimmer removes excess proteins & organics in your water column by exposing the water to a chamber that is flooded with air bubbles, the excess proteins and organics stick to these air bubbles creating a foam that is collected in a cup on top of the skimmer......IMO if your going to get a protein skimmer do some research, don't just buy any old one because there is def. a lot of crap out there, I'm assuming you don't have a sump so I personally would look into the octopus line of HOB skimmers, I have 1 on my FOWLR tank & I love it......I've also heard good things about remora skimmers as well, a bit more pricey than the octos though & like I said I love my octo, best $100 I've spent equipment wise.......HTH.......