What I am trying to find out is do you really need to add things besides ph/alk buffer, calcium or kalwasser? Things like DTs phytoplanktin or strontium and iodine. Are these really nessesary if you have strong lighting with a good photo period and do water changes regulary. I havnt added any of those products for a little over a year and am wondering even though my corals, clams, ect dont show it do they need it. I also know that adding to much can cause bad algae blooms because it boosts your excess nutrients. What are your opinions on this?