Thanks guys! This is my first experience with a reef and I feel that all is going in the right direction! The fact that you like it makes me happy! I hope that the T5s will make the corals look more colourful. I'm thinking about use the vodka method, I can't keep the PO4 at 0,00, yesterday I did the test and I had 0.03 that is good but non perfect. What do you think about it?