Question about crinoid

[Iccis Linn]

Any crinoid specialist here ?

Here's my question
I add some crinoid into my tank afew months back. I got 3 color
Yellow/Green & red one. Pic below

Yellow one doing ok growing abit but not fast like green one.

Green one's growing bigger & bigger

Red one didn't do so well.

So why are they so different.

Is that possible the green one can photosynthesis? Coz they moved to brighter spot and also grow faster.

Please let me know if you have any idea why or point me in right direction

I really wanted to know why some thriving & some dying.

Thanks in advance

 

[Piotr.F]

I really don't think that crinoïde are able to do any form of photosynthesis, according to my animal university biology lecture here in france they are only eating plancton. i would suggest to explain the difference of growing between your crinoïde that they are from different species or location (after all there is some crinoïde nearly in all around the world) and so have different need. Maybe someone with a greater exprience into Crinoïdes can expain greater why ther is such dufference betwenn them.

 

[Iccis Linn]

I really don't think that crinoïde are able to do any form of photosynthesis, according to my animal university biology lecture here in france they are only eating plancton. i would suggest to explain the difference of growing between your crinoïde that they are from different species or location (after all there is some crinoïde nearly in all around the world) and so have different need. Maybe someone with a greater exprience into Crinoïdes can expain greater why ther is such dufference betwenn them.

Thanks you, it's confusing to see some are happy & growing but some almost dying.