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Even though you seem to have some issue with me, I care more about the S. haddoni than your feelings towards me.
Your Mag is low, would prefer it to be around 1500.
You stated that nothing changed, but you stated that you just changed salts -- how long ago was that? Change of salts can sometimes cause issues.
Are you dosing anything, anything at all -- including sugar or any carbon type dosing.
Are the clowns still picking at the mouth?
Is there any brownish stringy "snot" comming out of the mouth?
How long have you had your current lights? What lights was it under prior to them?
Was this anemone from a local reefer, or was it shipped?
What are you feeding it, how often, and how large of pieces?
Any other anemones in the tank?
What do you have for flow?
It is always hard to tell with pictures, but it appears to be slightly bleached, and the tentacles are a tiny bit shorter than I would like to see.
What is in the tank that you use for your water changes? Might want to consider using newly made up water -- aged for 24 hours. (( want to make sure nothing is being transferred that could be causing issues --- newly { several months counts as new } shipped S. haddoni are very sensitive to excess bacteria, even "good" bacteria ))
Are you using RO/DI water? If so, what is the TDS?
You shouldn't see any waste balls, either the pieces are too big, or the anemone isn't fully digesting them --- which could lead to issues. Would hold off feeding for a couple of weeks (( that won't cause any issues, my current S. haddoni hasn't been directly fed in about a year now )).
What type of "fish" are you feeding it? Myself, and other experienced anemone keepers, have had major issues (( death )) from using silversides.
Do you have any pictures from when the anemone first came in? Want to see how close to death it was. While I wouldn't go this route at this time, you may want to do some reading on Ciprofloxacin anti-biotic treatment for anemones.
Did you acclimate it to your lights?
Trying to get rid of as many variables as possible...
Is the RO/DI unit yours? When is the last time you changed the pre-filter and carbon block? As TDS meter is the best way to tell if your RO/DI unit is still functioning properly. Again, trying to remove another variable.
What is the acclimation process that Maxspect recommends?
I would pass on the tuna, I prefer frozen (( thawed krill )) or PE mysis. From that picture, it looks like a common waste ball from anemone (( specially S. haddoni )), I believe it is stressed and not able to fully digest the tuna -- really think that holding off on feedings for a couple of weeks will help -- or at least remove a variable.
Hard to tell from those pictures what the foot is doing, but it sure isn't happy.
How deep is your sandbed?
Wondering if your flow sort of "pushed" it in that spot. All of mine (( have had 6+ years the years )) have always had their foot buried in the sand, right as the rock/sand interface.
Without look back, any shrimp in your tank ?
You should have to worry to much... Carpet will have a small gaping mouth from time to time... My has down this and I'm not quite sure yet why they do this... Your carpet looks to be healthy ... If the folds starts to droop and look sloppy then ill worry. Keep us posted

