What are these things? - The Planted Tank Forum
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  • 1 Post By TheDukeAnumber1
  • 2 Post By uluruguru
  • 1 Post By DaveKS
 
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post #1 of 10 (permalink) Old 09-16-2019, 01:06 AM Thread Starter
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This has been in my tank for over a month now and I can't identify it. It appears to be a colony of filter feeders. I took a macro video as best I could with a cheap lens I had, the first half is just a look at them and in the second half of the video there are baby brine bouncing around but they don't eat them they retract when they get bumped too much. They let out their fans and appear to be trying to filter feed and must be successful since the colony has gotten bigger. My fish leave it alone and my snails will occasionally crawl over it.

https://youtu.be/nCC4Z2Td1vc
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Last edited by TheDukeAnumber1; 09-16-2019 at 03:07 AM. Reason: pic
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post #2 of 10 (permalink) Old 09-16-2019, 03:39 AM
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Look like a type of hydra to me.
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post #3 of 10 (permalink) Old 09-16-2019, 03:51 AM Thread Starter
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Quote:
Originally Posted by DaveKS View Post
Look like a type of hydra to me.
I thought that too but not after filming how they interact with baby brine shrimp. Hydra would have eaten them, and I don't believe hydra forms dense colonies or can retract like these things can. I think these some what resemble a tube worm. But I've never heard of these being in fresh water.
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post #4 of 10 (permalink) Old 09-16-2019, 04:27 AM
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Maybe bryozoa?
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post #5 of 10 (permalink) Old 09-16-2019, 07:20 AM
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Looks like "baby" jellyfish, to be honest.... the form before they become what we know them as.
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post #6 of 10 (permalink) Old 09-16-2019, 09:15 AM
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Have you got any video? Don't think it has anything to do with jellys but you do get a freshwater variety. Whatever it is it looks interesting!
post #7 of 10 (permalink) Old 09-16-2019, 09:32 AM
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Freshwater tubeworms ?

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post #8 of 10 (permalink) Old 09-16-2019, 01:50 PM Thread Starter
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Quote:
Originally Posted by uluruguru View Post
Maybe bryozoa?

Yes thank you! Phylum Bryozoa Class Phylactolaemata (aka moss animals). Tiny filter feeding animals that live and grow in colonies.



So, anyone else ever have these guys? Are they indicators of anything?

Last edited by TheDukeAnumber1; 09-16-2019 at 02:23 PM. Reason: video link
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post #9 of 10 (permalink) Old 09-16-2019, 02:46 PM
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Never scene those before but pretty cool none the less. Seems like it would be healthy for the tank unless they all died off at the same time, thats just me assuming however.
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post #10 of 10 (permalink) Old 12-16-2019, 03:23 PM
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Just wanted to tie these two posts together. I just discovered these little guys in one of my tanks as well. I'll keep everyone apprised on how they evolve!

https://www.plantedtank.net/forums/3...l#post11284897

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