Starfish is Dying , Need some advice

[Vivek]

I am new to inverts and have a 1 yr old Fish tank with parameters being stable , My red starfish is only 1 week in the tank and last day it started losing white thread like strands and today I can see its one leg almost disappearing and now the 2nd leg is losing white strands , I am not sure what it eats but have not fed it anything since I got it . I assumed the algae and fish waste is what it will eat . Also the temp was 80F in my tank and other snails/crabs were doing fine in it and only 3 days back i reduced it to 78F as I understand they cant regulate temp with their bodies , Also my salinity is on the higher side ( my probe was reading wrong and I just figured I am at 38 PPT not 35 PPT ) . Besides this Nitrate is as 0.12 , Phospate is 0.04 , Mg 1400, Calcium 550 , Alk 10.4 ( this was around 9.5 last week )

Should I remove it from tank as my tangs will eat anything , I place on the floor of or near the starfish legs . Could salinity be the main issue or is it feeding or it is alk . I dont see anything attacking it . It stays stuck on the glass but is moving alright .

Any advice is appreciated

 

[T-J]

Your starfish is dying. I'm not a starfish expert, but they will start to shed and lose legs when it's in an environment that isn't favorable to them, most usually due to temperature.
Your tank may be a year old, but based on what you posted, it is NOT stable. I also see pearly white sand, so not much food in the sandbed for your starfish, which probably is starving as well.

Please research the needs of an animal before adding it to your tank. FYI, that type of starfish will pretty much eat anything it can crawl onto, including your corals.

 

[vetteguy53081]

This star is highly stressed, does not adapt well to changes in water quality and best for a mature tank. It does not feed on algae or detritus as food source but rather, mollusks such as scallop, clam and mussels
Also note they are capable of as they grow eating other starfish, sponges, soft corals, and other inverts. This species cannot handle air exposure if it was exposed to air upon introduction

 

[Vivek]

This star is highly stressed, does not adapt well to changes in water quality and best for a mature tank. It does not feed on algae or detritus as food source but rather, mollusks such as scallop, clam and mussels
Also note they are capable of as they grow eating other starfish, sponges, soft corals, and other inverts. This species cannot handle air exposure if it was exposed to air upon introduction

Are there any parameters i should target now to save this , or is it a lost cause .

I took it out of my display without exposing to air and tried feeding it clams but it keeps moving on the wall and sticking to surface and not eating anything , also now its 5th leg only the brown inner tissue is left but it is still moving . Should I be cutting an cleaning that leg out ?

I wanted to confirm if this is indeed the red knob sea star which seems to the closest match I could see and it does say its not reef safe and it was sold to me as a reef safe starfish that eats algae and other waste on floor and acts like a cleanup crew .

I am seeing the parametrs on my trident and neptune and everything is staying stable except the alk that changed over last week and temp that i manually reduced to help the starfish and salinity which didnt change but was always on the higher side . 37-38 ppt