Microrganisms

[Mynor]

Hello!  I found this morning some microorganisms on my new fish tank.  I have no fish only plants, gravel and spider wood.   Some have one tail and some have two tails almost the size of the main body.    What can I do?

[PotatoFish]

By "microorganism" do you mean you can only see them with microscope, or can you see them with just your eye? If you can take a picture of them, it would be nice to see what they look like.

They could have piggybacked on your plants, spider wood, or gravel. I honestly wouldn't worry too much about them though. Microbes are everywhere.

[Demobanana]

I know exactly what you have. I actually encountered some not too long ago when I was starting out. Cyclops and Copepods. Heard its a pretty good fish food (they have freeze dried cyclops). The only difference I can tell is 1 has 1 tail and the other has 2. They're not really micro IMO, but thats besides the point. hey usually eat detritus/anything decomposing like a plant. Don't think a dead fish though. Anyways, Im kinda dealing with hydra from them. so add something that will eat them before your tank gets infested!! Im kidding, but I am in serious deep water here. As long as you don't have too much, you're fine. They're part of a healthy planted tank. 

Oh, forgot to add, they're harmless. And kinda funny looking. You don't have to get rid of it. 

Let me be the first to tell you...they look horrifying up close in a microscope.

[Mynor]

Those are the best pictures I could take.  Thanks, I was going to take everything apart.  Now, I need to find a fish that would eat it.   It is a 10g and the original Idea was to move my 6 zebra danio from my betta tank.  Now every time I feed them, they crash into the betta and he end up with a injured eye.  

[Aubrey]

Definitely looks like cyclops. The two tails you reference might be egg sacs. I find them to be harmless and a good sign of a healthy tank that can support biodiversity.

[Demobanana]

I think too much is bad though. Got a hydra outbreak that way.