You guys have been amazing - and all is going very well. With only one exception (and that fish arrived already sick), I've essentially had no fatalities, and everything is happy and growing (the Xenia is 5 times bigger than it was when it went in last June). Now, as I approach the 6 month mark, I realize I'm going into a new phase with the equipment and tank - is the 6 month mark when it's time to replace the lights - and what about the RO/DI filters? (I've got a Kent Maxxima R 35GPD). I go through about 5 gallons per week. The clear canister is starting to discolor. I fired an email off to tech support @ Kent Marine to see what they say - but would love to hear from yins.