Help with ID please

New2dareef

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I cleaned up my frag tank this morning and then ran some errands with my wife. When we got home this critter was on my glass. Can anyone ID for me and answer the main question, good or bad? Thanks reefers
 
ImageUploadedByREEF2REEF1457303756.855428.jpg
ImageUploadedByREEF2REEF1457303774.970483.jpg
 
I've got a hundred of them lol. Sometimes I get a lil generous during feeding and when I do I get a bit of cyano n these guys clean it right up.
 
Asterina star. Some say they're harmless and others swear they are horrible. Mine don't seem to bother anything but when easy to reach I do remove them.

They also seem to increase in population with higher nitrates and phosphates
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • Not yet, but I have one that I want to buy in mind!

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