Quick question

[Trigger Fan]

My daughter noticed a very small spider on the front of my tank, and by small, i mean small. As i'am new to the sw hobby, what kind of spider could this be? Also, are they a bad thing in the tank? You can almost see right thru this one. Thanks for any and all replies.

[Sloth]

Could be just about anything. Most likely its a copepod.
But it could be a small hydroid jellyfish. Or an actual type of sea-spider.

[iCam]

But it could be a small hydroid jellyfish. Or an actual type of sea-spider.

Go to this link and scroll down to "dots with legs":

http://www.rshimek.com/odd_critters.htm#Digitate%20or%20Finger%20Like%20Hydroids


Is this the "spider" you're talking about? If so, you probably have a colony of hydroids somewhere on your live rock. There are also sea spiders as sloth said, but it's hard to know without a picture.

[Trigger Fan]

Originally posted by Sloth
Could be just about anything. Most likely its a copepod.
But it could be a small hydroid jellyfish. Or an actual type of sea-spider. Thanks, you are right, i don't think it's a spider. It's so small it's hard to tell, but it has about 10-12 legs give or take a few. My tank has been cycling for about 3wks now, and the longer it goes, the more things are starting to show up.

[Trigger Fan]

It looks like it's a hydroid Jellyfish, thanks for the help.