Green creatures on glass - The Planted Tank Forum
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post #1 of 33 (permalink) Old 04-10-2018, 01:37 AM Thread Starter
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Green creatures on glass

I noticed these things swaying in the "breeze" by my spray bar. It took a few tries to figure out how to get an in focus image using a phone but I managed it. Any idea what these are and if the are harmful or not.





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post #2 of 33 (permalink) Old 04-10-2018, 01:45 AM
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Hydra!
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post #3 of 33 (permalink) Old 04-10-2018, 01:45 AM
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is it possible that is Riccia?
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post #4 of 33 (permalink) Old 04-10-2018, 01:48 AM
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Here is a link about them.

I hope they don't end up causing you problems

https://www.thespruce.com/combat-aqu...-hydra-1381228
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post #5 of 33 (permalink) Old 04-10-2018, 03:21 AM
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is it possible that is Riccia?
No; you can see the tentacles

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post #6 of 33 (permalink) Old 04-10-2018, 04:02 AM
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Hydra!

Kill them!
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post #7 of 33 (permalink) Old 04-10-2018, 05:22 AM
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Green creatures on glass

That's hydra. If you really want to get rid of them, you can use fenbendazole based meds or this more natural Genchem product called "No Planaria". Apparently if you try to destroy them, the little pieces will form a new hydra from each so I guess either less feeding or meds are the best option. Hope this helps


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post #8 of 33 (permalink) Old 04-10-2018, 07:32 AM
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It's a Chlorohydra or Hydra viridissima, which is pretty harmless; the green coloration is from a symbiotic relationship with algae which differentiates them from the usual suspects. It is on the glass near the surface so as to get light for the algae. As far as I'm aware, Hydras, are only dangerous to fry and baby shrimp and even then not exactly a horror as they mostly feed on plankton.
Some fishes eat them. But if you don't get rid of them do keep them in mind if you ever give someone some plant cuttings!
As someone else said, do not squash them, if you remove them physically be really careful as they do grow from pieces of themselves in the same way that planaria do.
I've never found any kinds of Hydra in my tanks, I'm assuming fish have eaten them if they've ever gotten in.
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post #9 of 33 (permalink) Old 04-10-2018, 11:24 AM
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I never knew hydra could be green. Kinda cool.
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post #10 of 33 (permalink) Old 04-10-2018, 02:49 PM Thread Starter
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I noticed a new one showed up today as well in the same general location, I guess they came with the plants from my LFS.

I do have a video of them but wasn't sure if it could be posted or not.

Right now I have the Hydra and Copepods in the tank that were uninvited guests but there are not fish in there to help keep them in check right now as I let the plants settle in. The only inhabitants are 2 Nerites and 3 Amano Shrimp. My Betta will be moving in after another week or 2.

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post #11 of 33 (permalink) Old 04-10-2018, 03:43 PM
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I too just noticed them in a newly setup tank which has never yet had any livestock in it. Anyone know of any particular fish that might eat them and take care of the problem?

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post #12 of 33 (permalink) Old 04-10-2018, 11:55 PM Thread Starter
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Just dosed 10mg of Fenbendazole for my 5 gallon tank, now to wait 24-48 hours to see if they die and my 2 Nerites survive!

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post #13 of 33 (permalink) Old 04-17-2018, 09:34 AM
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How did it work out?
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post #14 of 33 (permalink) Old 04-17-2018, 12:38 PM
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I too just noticed them in a newly setup tank which has never yet had any livestock in it. Anyone know of any particular fish that might eat them and take care of the problem?
Per the link posted above*, Three Spot Gouramis, Paradise fish and Mollies seem to nosh on them.


*This link has lead me down a rabbit hole, and now I'm deep into reading about marine invertebrates. I don't have any marine tanks.
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post #15 of 33 (permalink) Old 04-17-2018, 12:51 PM Thread Starter
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The Fenbendazole killed the Hydra. I left in there for a total of 72 hours after which I did a >50% water change

My 2 Nerite Snails didn't make it, I noticed they were acting strangely after 12 hours so I relocated them to a clean container with similar water conditions and they never recovered.

I currently have 1 MTS snail, 2 Chopstick snails, and 3 Amano shrimp in the tank that didn't seem to be affected by the treatment at all.

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