I am trying to decide exactly what type of protein skimmer i should go with for my 55g. I currently have a double bio wheel my tank isn't drilled, my next one will be!! I am unsure what the best option would be I have seen many different however, I am limited due to the fact that I don't have a sump. I also have about 55 pounds of live rock I am considering more but I'm not sure if it's necessary. Any input would be great!!