Jellyfish taking over my NUVO 10

[Omikayalan]

Hello, I will be very grateful if someone could help me with these jellyfish ephyras. They spawn out of nowhere and now i might have a hundred or two in a cup of plastic with holes i made for them inside the tank. I currently feed them rotifers and planctonic copepods but i dont really see them eat or catch anything. It would be very interesting to watch them grow. Any suggestions please? Also, someone told me they could be Sanderia Malayensis, which is a good possibility.
Thank you.

 

[RockRash]

I had a outbreak of them in my first tank years ago. I cant help with keeping them alive. The ones I had dissapeared almost as soon as they showed up. I have no idea where they came from. Definitely tagging this one for information. Good luck!

 

[Lasse]

It seems to be in the medusa stage but the spawn was probably a time ago. Below you can see typical jellyfish development stages

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Sincerely Lasse

 

[Lasse]

Living rotifers and newly hatched artemia nauplii is rather good food in all stages.

Sincerely Lasse

 

[Omikayalan]

Thank you for answering. I made a post in reddit asking the same and i got downvoted to hell because people said they were hydroids and not jellyfish. Every one in reddit seemed to be very sure that were hydroids with no doubt. How can i distinguish them? If they are hydroids do i have a problem of infestation? More pictures:

I had a outbreak of them in my first tank years ago. I cant help with keeping them alive. The ones I had dissapeared almost as soon as they showed up. I have no idea where they came from. Definitely tagging this one for information. Good luck!

 

[Omikayalan]

Living rotifers and newly hatched artemia nauplii is rather good food in all stages.

Sincerely Lasse

Thank you Lasse. I already bought rotifers. When i said "planctonic" copepods i meant pelagic.

 

[Omikayalan]

Here are the polyps where they spawn. Hydroids?

 

[Lasse]

I can´t judge if it is true jellyfish or medusa´s from a hydromedusa population. There is hydroids that have a medusa stage. Here is a good description of real jellyfish life cycle and here one about hydromedusa. Here more about hydromedusa.

If it is a hydromedusa - the reproductive stage is the medusa. They can reproduce vegetatively as well, but if they have a medusa stage, most of the reproduction probably occurs in that stage.

Do a Google Use as an examplel "Differences between true jellyfish and hydromedusa"

In your second video - its no doubt that is a medusa stage of some organism.

I assumed you knew it was a jellyfish. But it's difficult because they have both polyp and medusa stages. To complicate things even more - there is a third organism with both polyp and medusa stage - the comb jellyfish

Is it a newly started tank with no fish?

Sincerely Lasse

 

[Stomatopods17]

true jellyfish hitchhiking is incredibly unlikely and especially wouldn't be in those quantities.

in 95% of cases (giving 5% incase the 'anything is possible' rule bites me) they're hydroids, they population boom then disappear.

JellyIDFAQs

EDIT: here's one of yours getting pretty close to that

 

[Omikayalan]

true jellyfish hitchhiking is incredibly unlikely and especially wouldn't be in those quantities.

in 95% of cases (giving 5% incase the 'anything is possible' rule bites me) they're hydroids, they population boom then disappear.

JellyIDFAQs

EDIT: here's one of yours getting pretty close to that

So is it a waste of time and money to try to raise them? Some hydroids are cool too but they stay tiny and the medusa stage is brief right? They could even become a pest i think...

 

[Stomatopods17]

Yeah I wouldn't recommend it.

Almost every new tank gets their early hydroid population boom and it fizzles out. If you wanted to try jellies you'd be better off looking into getting real ones in their own display.