Mini jellyfish?

[coral papa]

I've recently noticed these little jellyfish looking thing in my tank and there's at least like 10 of them in my tank, I've also noticed an anemone that resembles aptasia but I couldn't get a clear picture

 

[Joe31415]

Here's some little tiny jellyfish I found in my tank a while back.
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and my thread asking about them:

What is this thing fluttering around in my tank?

I just spotted this thing. When I first saw it, I assumed it was a part of one of the anemones I've been chasing around the tank for the past month, but it's clearly not. Ball Anemone maybe? Here's a video of it after I managed to catch it.

www.reef2reef.com

 

[Joe31415]

Also, here's a direct link to them on imgur that you can use if they're not showing up in that post.

 

[coral papa]

Also, here's a direct link to them on imgur that you can use if they're not showing up in that post.

My jellyfish things are very tiny and look like those badminton balls

 

[ToadMilk]

They could be the hydroid medusae but it's difficult to tell from your picture. About how large are they? Here is a picture of a hydroid medusa I took with a microscope after a bloom in my tank.

 

[coral papa]

They could be the hydroid medusae but it's difficult to tell from your picture. About how large are they? Here is a picture of a hydroid medusa I took with a microscope after a bloom in my tank.

Here's a better picture

 

[coral papa]

They could be the hydroid medusae but it's difficult to tell from your picture. About how large are they? Here is a picture of a hydroid medusa I took with a microscope after a bloom in my tank.

It does look like those, are they harmful?

 

[DaJMasta]

Still hard to see, but I'd say medusa stage hydroid is more likely. There are a number of creatures with at least one life cycle stage that looks like a jelly that can be in our tanks, but hydroids are the most common and that clear bell with little dots around the rim seems to be a more common one of them too.

 

[coral papa]

They could be the hydroid medusae but it's difficult to tell from your picture. About how large are they? Here is a picture of a hydroid medusa I took with a microscope after a bloom in my tank.

Mine has longer tentacles

 

[coral papa]

Still hard to see, but I'd say medusa stage hydroid is more likely. There are a number of creatures with at least one life cycle stage that looks like a jelly that can be in our tanks, but hydroids are the most common and that clear bell with little dots around the rim seems to be a more common one of them too.

Thanks, are they harmful?

 

[Tavero]

Your pics are sadly not good enough to identity anything.

Some pics made by me.

These jellyfish are hitchhikers that come either with freshly hatched artemia or get released from sessile jellyfish that are somewhere growing on live rock. In both cases they will die pretty fast inside a regular reef tank.

To figure out if they are harmful or not, you would have to find the sessile jellyfish colony in your tank, if there are any.

 

[DaJMasta]

Thanks, are they harmful?

Not generally. There are kinds of colonial hydroids which, if in a tank well fed with particulate foods, can grow rapidly and cover surfaces where other organisms would be, but most don't, and I don't know if catching and removing the medusae would be at all effective in reducing or controlling the population even if they were a harmful type.

 

[Tavero]

This is my colony. They have a green fluorescent color and I can frag them like a regular coral. They don't multiply fast and stay in the same spot. A week ago a coral had fallen on that colony damaging it. They are quite sensitive.

I heard from other species that can turn into a pest because they spread fast and are hard to remove and are much more sturdy.

 

[coral papa]

Thx

 

[coral papa]

Your pics are sadly not good enough to identity anything.

Some pics made by me.

These jellyfish are hitchhikers that come either with freshly hatched artemia or get released from sessile jellyfish that are somewhere growing on live rock. In both cases they will die pretty fast inside a regular reef tank.

To figure out if they are harmful or not, you would have to find the sessile jellyfish colony in your tank, if there are any.

Here's a somewhat better picture

 

[coral papa]

This is my colony. They have a green fluorescent color and I can frag them like a regular coral. They don't multiply fast and stay in the same spot. A week ago a coral had fallen on that colony damaging it. They are quite sensitive.

I heard from other species that can turn into a pest because they spread fast and are hard to remove and are much more sturdy.

Like this thing?

 

[ISpeakForTheSeas]

Like this thing?

That looks more like a feather duster worm than a hydroid polyp in this case.

Here's a somewhat better picture

This pic is good enough to confirm that it's either a hydroid or jellyfish medusa, probably a hydroid.

With the longer tentacles on yours, I haven't looked into hydroids around Indonesia enough to give a proper suggestion on species to look up for your location, but for common hydroids with long tentacles here in the US, we get a lot of Cladonema species. You can look at those and get an idea of what some can look like with longer tentacles.

 

[Tavero]

Like this thing?

Thats a feather duster worm. Their tubes are made out of calcium. Jellyfish tubes are out of chitin or something similar.

Here's a somewhat better picture

I mean, yes, these look like jellyfish. Have you fed with self hatched artemia? Or do you have live rock in the tank. The sessile form could be a pest, or harmless like mine.

 

[coral papa]

Thats a feather duster worm. Their tubes are made out of calcium. Jellyfish tubes are out of chitin or something similar.



I mean, yes, these look like jellyfish. Have you fed with self hatched artemia? Or do you have live rock in the tank. The sessile form could be a pest, or harmless like mine.

I've never fed artemia before and I only use dead rock

 

[firehawk922]

Are these jellys