Identification help

[fbdizzle]

I need help identifying these creatures. Several of them popped up a few days ago. At least 20 of them, and they love to crawl or slide around on the glass sides of the aquarium. Almost like a slug does, and slow moving. I have attached two pics. I also noticed another new creature in my tank. Also hanging out on the glass sides and front of the aquarium. Hundreds of little flea like creatures, but even smaller and the size of a Bobby pin tip. They are fast moving all over the glass which makes me think their different then the other slug like creatures I first mentioned, and need help identifying. So I'll attach a picture of the slug like creature, but the flea things are too tiny and fast moving to get a picture. So I need help identifying. Also whether good or bad. And also how to eliminate these intruders. Thanks

 

[bertoni]

<img src="/images/welcome.gif" width="500" height="62"><br><b><i><big><big>To Reef Central</b></i></big></big>
The flea-like things could amphipods, copepods, or mysid shrimp. Google will turn up some images. They generally are good to have. The larger creature looks like a flatworm. Most species of flatworms are fine. Convolutriloba retrogemma is a somewhat-common exception.

 

[Mike Ordner]

Picture shows flatworms. Small fleas things are copepods. Copepods are good guys. Flatworm can either be good or bad. If you do not have any coral, then could be just grazers and will go away when nutrients stabilize. If they came in on a coral, then they eat said coral and need to get them out of the tank.

 

[OrionN]

The two flat worm on the glass or fine. They are not parasitic flat worm or the dread rusty red flat worm that can be a huge pain.