Thanks for the advice to all. This Thursday its a month in operation so I will unplug the 500. Then I will keep doing water checks every other day. I want to play it safe because my setup is perfect and usually when you start changing things up is when you have problems, Thanks again everyone, I am starting to study about saltwater setups. I just ordered a book on ebay its called THE CONCIENTIOUS MARINE AQUARIST. I am working on the woman slow as I need her to make some room in our living room for a 120 or 180. I have a bite for a 120 for 300 bucks and waiting for that phone call. I will keep you guys informed