I'm no expert but is that same colony as the green frogspawn above or was it a different colour before as that bottom one looks brown? So could it be bjd ( brown jelly diesese) ?
As I can't see nothing that resembles bubbles but maybe can't see the wood because the forest idk
But as I say no expert here,just see brown lol
Ok can see edge of that frogspawn was greenish but rest is brown so some algae growing on it producing bubbles ( can see some that looks like could be bubbles or/and at end of tips of tentacles so brown algae growing on nearly dead coral or bjd ?
I know my torch that got bjd didn't produce bubbles though but caught it quick and gave witch hazel dip straight away but binned it as just fell to bits but maybe I'm way off point
Good luck
hi thanks il take a photo in white when home from work
param are alk 9.1 sali 1.025 mag 1290 cal 400 phos 0.06 was 0.12 but been bringing it down over a few weeks .