AC gets exhausted/saturated within ~2 weeks.

Flipping the Macroalgae weekly?, but that didn't say whether it is growing and at what rate it is being harvested? For example, how often is half removed to reduce the ball of Chaeto to it's previous amount?

I was wondering if the coral are looking better and what the PO4 level is currently?

Aloha,

Mark  

My opinion is that because there are so many things that need to be in balance, if several things are slightly off balance, and then along comes another thing that tips out of balance, a tank crashes. Any of these things could have been going on, from Alkalinity to water changes and from lack of biofiltration to flatworm treatment. Even lack of food which I suggested earlier as too little N compounds in the water, could cause something, such as the entire population of a particular bacteria to die en mass. Bacteria is the unseen "organism" we often talk about, but cannot see. I'm just speculating, but that could have been the first domino to fall. 

It's not often that I suggest this sort of multiple-off-balance hypothesis as a possible reason for a tank crash, but it seems appropriate to bring it up here. A good follow-up discussion might answer the question of how to bring things back into balance and how to ensure better stability from here on. I have some ideas, but would like to read what you all think.