Well my tank is about 16 months old and I've had very few problems. I would like to thank melev and co for creating this site (Ithink it's the best ) and my local fs owner (Justin Deans of Aquaria) for " sharing of the knowledge." I feel I would not have been sucsessful without this site and Justin. My family spends quite a bit of time marvelling at our own little ocean reef. Things change,react,grow....the whole experience constantly blows my mind on a daily basis! Thank you all for sharing ...