Brown film

[Tek]

I noticed some brown/black film on a green nepthea tree and 2 days later a branch disconnected. The rest of it is well now. I also noticed a small white spot on my green pocilipora the 2nd day and within 24 hours I lost my small 3colony covered in a brown film. The rest of my corals are fine and water test are on spot. What is causing this?

 

[happysak]

This could be brown jelly or protozan infection. Temperature spike, water quality( what is your no3 and po4), coral tissue trauma can initiate it.