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I guess another question that I have is what is a refugium compared to a sump. I understand a sump is another way to hide the heater and things like that and also gives a place to seperate "dirty" and "clean" water during the process, but what exactly is a refugium?

I am new to saltwater tanks and came across this forum, luckily, before I jumped into anything. I went to the LFS to ask a couple simple questions on what I needed to get started and how much different the tanks are from FW. Upon getting the answers to a couple questions I realized that it was...