Thank you all very very much! I don't really know what would i do without you all! this is a greatest board!!! if i have one question I will have a hundreds of answers. It doesn't matter how big your tank is 10, 20, 55,75, 110, 400, 600 gallons it still is your tiny little ocean in a living room. And you all pro's always give such a great answers, advises or just an opinions to us newbies how to survive greatest disappointments that most of us had to go through. Thank you all again. Alex.M