Sand Sifting Starfish - Diminished Activity levels

[Neuratox]

Good evening everyone. I was hoping that someone could shed some light on a situation for me. I've got 2 sand sifting starfish in my 90 gallon and I've had them for about 5-6 months. Over the last two months I've noticed that they are a lot less active. They certainly move from one to place to another, but they aren't climbing all over the glass on a constant basis like they once did. I'm not sure if it is a bad/good/neutral sign that they spend virtually all of their time in the sand... *contemplates their name* Any input on this would be much appreciated. Thanks in advance!

 

[albano]

Be thankful that you got 5 months out of them... very few survive long term and they really should not be kept in hobbiest tanks