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Planaria Or Nematodes? Harmful To Ghost Shrimp?

DeanoL83

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Hi, I'm not sure if this is really an emergency or not but thought I'd post it here just in case.
 
I have had a 20L tank sitting around empty for a while as I recently moved house.  I decided to get it back up and running just a few days ago so I could use it for a shrimp breeding tank.  Previously I had placed shrimp into my four foot community tank but think most were eaten, so decided to catch the ones I could find and place them in their own little sanctuary.
 
I rinsed out the gravel in the 20L quite a few times.  I took a scoop of gravel from the community tank and put it in the 20L.  I took some filter media from the community and put it in the filter of the 20L (whose media was still actually quite wet despite sitting around unused for a couple of months).  I filled the 20L with water from the community tank so that it would be cycled for my shrimp straight away.  I caught my shrimp and acclimated them slowly over a few hours before releasing them.
 
Yes, I know shrimp need a mature cycled tank but it was a quick decision to try and stop them from getting eaten.  I did everything I could to make sure the 20L was cycled for them.  I have tested the water everyday and it comes back 0 ammonia, 0 nitrite and 5-10 nitrate.  I have changed 15-20% water every second day just to be on the safe side.  All shrimp seem healthy and happy and moving about.
 
However, a day after I got the tank up and running I noticed the back glass of the aquarium was covered in little white worm-like things, only about 3mm long.  They are slowly moving along the glass.  After doing some research, I think they are planaria as they appear to move along the glass like a slug - just slowly in a straight line.  However, I also came across nematodes while doing research, although they apparently move more snake like, making me think that I have planaria.  On the other hand, another site said that nematodes reside in the gravel and will only appear on glass if the gravel gets disturbed...which is what happened in this case.  If they are nematodes, how do I know if they are the parasitic or scavenger form????
 
I have attached a picture but its not the best quality sorry.
 
My questions are:
 
(1) What do you think they are given the picture and the circumstances?
(2) How would they have gotten there?
(3) Are they harmful to my shrimp? I've read that they may be harmful to baby shrimp or shrimp during the molting process (but I can't remember whether this was for planaria or nematodes or both)
(4) Should I try and get rid of them? If so, how do I do it without harming my shrimp?
 
Thankyou so much to anyone who can provide some advice! I've never came across these little buggers before!
 
Cheers,
Dean
 

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How common are gnats in Australia?

I ask because that's exactly what it looks like. I had an old vinegar eel culture that got ruined and gnats eventually moved in and laid eggs. The gnat larvae looked exactly like this. These almost look too thick to be planaria or nematodes. You can barely see planaria or nematodes with the naked eye - if at all. The fact that these show up so easily like that, makes me think insect larvae.
 
Ahhhhhh now that could be it too...after looking at some of the pics of gnat larvae in water on google....
 
When I purchased the shrimp I did find something weird in the water they came with...I've attached the pic - is it mosquito larvae????
 
If they are gnat/mosquito larvae are they harmful? What should I do?
 

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actually, after doing some research the thing in that last picture looks like a dragonfly larvae or damselfly nymph, not mosquito larvae.
 
 
So, I'm back to thinking it's planaria........
 
Yeah mosquito larvae has no legs so it's not that.

I'll have to get on my laptop and do a photo comparison to see what the second thing is. But the first group could still be insect larvae. If you do have gnats in Australia, it just takes one female laying eggs in the water to find larvae there later on. So you might not even have seen it. Whatever they are, they didn't have to come from that second creature you pictured. He could have died off and some lonely gnat wandered in later and plunked eggs into the water.

And if the gnat laid eggs in the main tank, it's likely your fish ate the gnat and/or the other larvae.

The good news is, gnat larvae won't hurt your shrimp. Like fly larvae (maggots), they go for dead and decaying organisms. The ones that took over my former vinegar eel culture went for the decaying apples and dead vinegar eels (the colony was already dead by then).

My only problem was in not BLEACHING them out of there. They survived and turned into gnats again right as I started up a growing medium for microworms. I haven't got any microworms yet to put in there, but they already turned it into a gnat larvae home.
 
Damselfly larva
 
Looks like planaria to me.....they just appear, usually if the tank has an excess of food. I would NOT trust them with shrimp. I would be getting rid of them pronto...buy "No Planaria" it is safe to use with shrimp, providing you follow directions
 
Thanks for all your help Ltygress and Alasse.
 
Yeah, I agree Alasse I think it was damselfly larva too.  And I'm thinking planaria....will any fish eat planaria but won't eat the shrimp? Or is it better to just get the No Planaria that you're mentioning?
 
I just bought the No Planaria, it will last you for ages, very handy to have
 
Thanks for the info....I haven't seen it before but then again I haven't been looking for it, do most LFS or Petbarn stock it?  Or do I need to get it online?
 
Is it something I need to get asap? As in go to a LFS, or can I wait for one to be delivered if I get it online?
 
What do the planaria actually do to shrimp?  Do they eat them?
 
Without seeing the head of the white things on the glass its actually very hard to tell if they are in fact planaria. Planaria have an arrow shaped head. I am actually thinking the white things on your glass are a less harmful Rhabdocaoela.
 
DeanoL83 said:
Thanks for the info....I haven't seen it before but then again I haven't been looking for it, do most LFS or Petbarn stock it?  Or do I need to get it online?
 
Is it something I need to get asap? As in go to a LFS, or can I wait for one to be delivered if I get it online?
 
What do the planaria actually do to shrimp?  Do they eat them?
I had to buy it online :)
 
The eat them....i went from hundreds (500+) to 30. I was told they are harmless, they most assuredly arent
 
Thanks for the information Baccus, I have never heard of Rhabdocoela before, but after looking them up that could definitely be it too....hoping so, as they are not harmful!
 
Will try and get a closer look at them.
 
I've read that apparently planaria have a triangular shaped head and two dots for eyes so will look out for that, and try and get a better picture if I can.
 
No worries.
I hope they are the little Rhabdocela and not planaria.
I have heard mixed reviews on the No Planaria product, so I would try to identify what you have before going ahead with treating the tank, with something it may not need.
 

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