help! what is this, is good thing?

[TVR]

Hi:
Dont know what is that, but as my setup started, I did see some on my rocks, but lately, I found those one by one disappeared ! - I dont know good or bad, but gone for good as I thought they look not so nice. Truely, I dont know "who" is eating those but everything else seem doing ok. Like this guy (dont know the name but my wife and me got it from Red Coral for $60

[subman]

Is it just me or is this the most confusing thread on Canreef?