ok after re-reading the thread I see that you are using ro/di water. How often are you doing water changes and how much are you changing at one time?
I would stop feeding the plankton and cut back on the amount of food you are feeding the fish and shrimp to only a few times per week until your algae issues come under control. Try to monitor everything that you put into your tanks as the nutrients have to come from somewhere. It sounds like you might be feeding too much food too often. This might be the source of your ammonia if there is uneaten food decaying everyday. But still your nitrates normally should be measurable in a new system like yours.
Can you post a pic of the brown algae again so we can compare it with previous photos? How is the refugium doing? You added some chaeto right?
I would not add anymore corals until your current issues are resolved. What is your acclimation process for adding new corals? After previous corals had died did you perform any water changes?
Are you still running carbon? If so, how often are you changing it?
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