ID / Help with Aiptasia ?

[frddns83]

Hi !
I have a 18 years old 150 gallons tank.
I never had any issue until a few months ago, everything went wrong at the same time :/
Probably got a power outage that went unoticed: my skimmer died + my heater went rogue (82°F).
I was not there ... My wife did not notice for a week. At the end of the week, I had some NO2, NO3, PO4, some Xenia (soft coral) died and everything got worse ... I lost my Hepatus and my Flav (both with me since the beginning), followed by smaller fishes.
Only survivors are a couple of Clownfish and their entacmea quadricolor ...
Since then, i fixed my hardware and parameters are all good.

However ... my tank is getting covered by small anemones that look like Aiptasia without long sleeves. See pictures attached.
The biggest of those things are 4 to 5 months old I would say, and are .3 inch wide. It's really small by I have got hundreds of those ...
Can someone help identify this? Any idea how to get rid of this pest?

I added 5 L. Wudermanni and 2 Tomentosus a few weeks back. This does not help at all, its getting worse every day.
The tomensosus are not touching those things ...

P.S: I am French and tried to get help from local forums and professionals, so far no luck :/
Thank you for your help

 

[frddns83]

An old picture ... taken last time i moved. This tank supported 3 moves in the past 8 years ...

 

[frddns83]

sorry, the names were "french"
got 5 peppermint shrimp (L. Wudermanni) and they don't touch it.
got 2 filefish (Tomentosus), they don't touch it either

 

[Troylee]

Wow… those look different than what we see here in the states.. I don’t know if you can source bergia nudibranch over there but they would have a field day!

 

[Reefkeepers Archive]

Colonial Hydroids, extremely invasive, fast growing and sting corals, as you've noticed your traditional aiptasia remedies don't work for these, there are some threads around here for a tankwide treatment to kill off these

 

[Troylee]

Colonial Hydroids, extremely invasive, fast growing and sting corals, as you've noticed your traditional aiptasia remedies don't work for these, there are some threads around here for a tankwide treatment to kill off these

Don’t look like colonial hydroids to me as those have long stalks and look like feather dusters almost. It very well could be thou… the one time I had some I threw the rock in a acid bath to kill them off lol..