Strange Creature/plant/algae

[Munroco]

I found these on the glass of a small tank I'm growing some fry out. There are 3 or 4 of them. Each time I look they are a different shape, so they are moving about albeit slowly. I've no idea what they are. Any ideas? BTW the tank is covered in algae as I'm letting it grow to help feed the fry.

 

[BaylorPerez]

looks like fish poop XD

 

[Munroco]

There aren't any fish in the tank except fry that are about 1/2 the size of these things

 

[RainboWBacoN420]

Hydra worms...

They can be harmful to the fry that you're trying to raise. They sting their prey much like anemones do with their wavey tentacles. They are also a pest to micro fish and shrimp, especially.

Bryon will probably be here soon to give you a full article of information for ridding these pests of your aquarium.

 

[Bubbelzzz]

Indeed hydra, really annoying creatures.
 
Be careful when removing them because they can regrow from broken body parts. This means that if you didn't remove him entirely he can regrow. It can even be the case that you help them spread through the tank when they are torn in pieces. Best it to kill them when they are in the tank. If I remember it correctly you can use easycarbo for this. You need to use a syringe for this. Spray it all over them. Instead of easy carbo can you also use really hot water (preferrably boiling). 
 
Flubenol can also be used to get rid of them. However, do take care with this stuff. It can kill yous snails and shrimp too.

 

[RainboWBacoN420]

They are the cousins of corals after all. You should get rid of them as soon as possible while you still can before all the fry are preyed on. 
 
Another chemical you can use in Fenbendazole, you should definitely take caution when using this chemical as it can be difficult to dissolve into the water column and may slightly drop your pH.
 
You can read further here:
http/www.planetinverts.com/killing_planaria_and_hydra.html
 
Good luck, friend. 

 

[Baccus]

I do not believe what you have photographed are actual hydra. I have done plenty of battles with dreaded hydra and they look NOTHING like what you have photographed. But what I do see is something that looks vaguely like something I have seen in somebodies shrimp tank called colonial bryozoan.
Otherwise I would say its possibly something like a slimemould, but I think they only occur on land but in damp environments.

 

[Munroco]

Interesting replies. I don't think they are hydra either. From what I remember of hydra they have a body with a few tentacles at the end, this stuff doesn't seem to be in that form.
 
I just looked up slime mould online, and I think you have cracked it Baccus. Reading about it, apparently it eats green spot algae. You can see from the latest pic that these 2 seem to have been drawn to it. Green spot algae is a nightmare to get rid of, maybe I'll try to breed this stuff and sell it

 

[Bubbelzzz]

To me they do look like hydra. They are multiplying though. If they multiply they can grow new baby hydras on their own body which will detach eventually.

 

[Munroco]

I think we were posting at the same time Bubbelz, there are some more pics above.

 

[Baccus]

If I had of had more time this morning I would have added that hydra look like little sea anemones, they will branch and have little off shoot babies on their "stem" but again they will still look like anemones.
I would suspect that what you have is slimemould and that its doing you a favour  

 
Actually slimemould is an interesting critter, it moves but is not an animal, and its no longer considered in the fungus family. I guess you could say its a cross over between plant and animal. Scientists have also shown certain slimemoulds to have a very basic brain. One scientist even replicated Toyko's rail system using food and bright lights to encourage the slimmould to inhabit certain areas.