wow sergio. I just read this thread from the beginning and I have had similar issues with dosing and with my tank crashing with algae and coming right back. What i stopped doing is dosing all together and just changing water on a bi-weekly basis and it seems to work for me. At first when you were having a CA problem i thought it was cause of that huge clam of yours using it up too fast. anyway. your tank was crazy packed for a while. it amazed me how you were able to keep so many different species of coral so close to each other without them killing each other. I never test my water for anything and I get good growth from all my coral, but your growth from your corals makes me wanna see what my params are just to see. All in all your tank still looks beautiful even after the crash.