I actually was curious if I too could get some information on reactors. What is the purpose and importance of a reactor. Is it necessary or is it just an extra thing to help out. I have a 90 gallon tank I am currently setting up and I have a 20 gallon sump. What are some recommendations. I also have a wet/dry filter that sits in my sump but the more I am reading it doesn't seem anyone ever uses wet/dry. Please any help would be great because I am new to saltwater.

