Green grape micro algae

[Patrick]

I had a bunch of grape algae doing fine. When I return after a few days overseas they disappeared totally without a trace! Is this possible?

[vidextreme]

I guess the algae you have are caulerpa?

If so then most likely the reason they're gone is that they went to a sporulation stage or most commonly termed as "it-went-sexual".

Some say when this happens, all similar species algae in the tank ,regardless if they connected or not, will simultaneously release some stuff that will cloud the tank and some reported even kills fish and/or corals.

The algae itself will die and decay in this process.

This might explain their disapperance.

Did you experience some lost or missing fish or damaged corals whe you were away?

[Patrick]

Thanks bro. I googled and guessed that's what happened. First time experienced the whole plant disappeared roots and all... One fish casualty but generally lps are ok.