What is this and how can I fight it?

Flowmaster · Nov 3, 2020

I believe this is either a rogue bacteria or dinoflagellates. I am not carbon dosing and all parameters look great. The sump gets slimmy stuff in it and the filter pad also gets very slimmy, water is cloudy too. Tank has been up for years no fish die off but coral are getting very pale, some colonies have died. Need some help with ID and what do I need to do to kill it. Thanks

Dan_P · Nov 3, 2020

I am having trouble seeing enough detail in the pictures to comment.

homer1475 · Nov 4, 2020

Dan_P said:
I am having trouble seeing enough detail in the pictures to comment.

Same

Also saying "all parameters look great" means nothing to us. What you think may be perfect, may in fact not be perfect at all. We need hard numbers.

Flowmaster · Nov 4, 2020

Parameters are:
Ammonia 0
pH 8.2
Nitrite 0
Nitrate 0- which seems to come from the consumption of it by the bacterial growth may be?
phosphate 0
Calcium 400 ppm
Alkalinity 9