What is it? Is this some kind of slug? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 17 Old 12-09-2010, 01:42 PM Thread Starter
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Exclamation What is it? Is this some kind of slug?

I have a 29 gal with Black skirt tetra and a few of their fry (separated by divider) in it. I feed them Tetra flakes, dried shrimp and the fry get cultured infusoria and Hikari first bites. I have been doing partial water changes daily. I have been hesitant to gravel vac because of the fry, but noticed a slight ammonia spike some planaria and a population increase in the hitchhiker pond snails, so started to vac again. Before I dump the siphoned water I always take a good look to make sure no fry got sucked up. Today I did find one and kept a better eye out. Be cause of this I noticed at the bottom of the bucket there were a few tiny slug like creatures moving around. I scooped one into a small clear container. It slides around fairly quickly along the bottom and sides of the container and at first I thought it was just snail excrement. It's smaller than my fry and when it is disturbed it curls up in a u shape and floats until the water settles again. I thought maybe it was a snail baby without a shell, but I read that they are born with shells and do not leave them, so what the heck is this thing? Is it something I should be concerned about? Any help would be appreciated.
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post #2 of 17 Old 12-09-2010, 01:53 PM
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From the way you describe it maybe it's daphnia?? How about google some images of daphnia and see if that's what they are??

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post #3 of 17 Old 12-09-2010, 02:00 PM
Its a planaria. You already said you had some too.......

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post #4 of 17 Old 12-09-2010, 03:36 PM
pictures would help.
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post #5 of 17 Old 12-09-2010, 07:55 PM Thread Starter
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I didn't know they looked like that, too. I have tiny white worms on the tank glass that are very skinny which I thought was the planaria. Is it 2 different types or maybe one is a more mature form? I can't seen to get any good pictures. I'll I'll get my husband to try later.
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post #6 of 17 Old 12-09-2010, 08:22 PM
Skinny white "worms" that move in a S-like pattern are nematodes a type of detritvor. Planaria are much larger and move "slug-like" they can shorten and lengthen their body, but can not move in a undulating S-like motion. Large planaria often have a arrow like head and visible eye spots.

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post #7 of 17 Old 12-09-2010, 08:59 PM Thread Starter
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The white ones are almost as thin as hair and sort of glide around on the glass. They do stretch or get really short but never move in an S pattern. Even when they are floating from being knocked off the glass they seem to just stay straight, only bending a small portion towards one end.
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post #8 of 17 Old 12-09-2010, 10:30 PM
probably little planaria

this is an adult planaria

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post #9 of 17 Old 12-09-2010, 10:37 PM Thread Starter
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This looks kind of like the thick slug like one I found today. Hopefully the little stringy guys are just the young version like you said. In that case I shouldn't worry? Just keep doing the water changes and siphons and I will eventually get rid of them?
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post #10 of 17 Old 12-09-2010, 11:36 PM
yup. most fish will also snack on them.
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