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Old 07-27-2020, 12:27 PM   #1 (permalink)
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Default Critter Identification

Hello!

I'm setting up a new tank, and as there's no apex predator yet, I'm in the fun stage where lots of little critters appear from seemingly nowhere in the tank.

I'm wondering if anyone can identity this flatworm-looking thing.
https://streamable.com/8vo74p
It's quite large, probably 3/4" when extended. I've spotted a couple, and while they tend to crawl around like in the video, they sometimes undulate like a flag in the wind.

So far, I've only purposefully introduced snails and blackworms to the tank. Could these guys be feasting on those?

Thanks!
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Old 07-27-2020, 12:33 PM   #2 (permalink)
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Default Re: Critter Identification

Based on this article, it may be a snail-leech: https://www.aquasabi.com/aquascaping...-your-aquarium

Looks like my snails better watch their back!
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Old 07-27-2020, 12:51 PM   #3 (permalink)
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Default Re: Critter Identification

Seems like a leech.
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Old 07-27-2020, 01:03 PM   #4 (permalink)
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Default Re: Critter Identification

Is it just me, or is it kinda cute?

Although it will be less cute if it eats all my snails...
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Old 07-27-2020, 01:49 PM   #5 (permalink)
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Default Re: Critter Identification

It'll be less cute when you have hundreds of them crawling around
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Old 07-30-2020, 11:18 AM   #6 (permalink)
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Default Re: Critter Identification

Leeches arrive in blackworm batches. There were some in mine, and I picked them out of the batch with tweezers before adding the blackworms to the tank.

The good news is they're easy to pick out with tweezers. There aren't usually many that show up in a blackworm batch, so you probably don't have very many. I'd just pick them out when I found one. I don't think there's any way to treat for them without killing the blackworms. I wouldn't worry about it and just keep an eye out for them and pick them out when you see one.

Also, depending on what kind of fish you are going to add, the fish may eat them. My corys seem to eat anything attached to the glass like that. They won't eat the pest snails, unless I smash them first, picky devils, but they appear to have taken care of little planaria type worms that would crawl on the glass. The corys go up and down the glass, eating algae and whatever is on it - other than snails.
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Old 07-30-2020, 11:28 AM   #7 (permalink)
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Default Re: Critter Identification

Thanks @Karen in San Jose. I removed that one from the tank when I was taking pictures. I'd seen another at some point, but it seems to be gone now. Makes sense that they came in with the blackworms!
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Old 07-30-2020, 11:32 AM   #8 (permalink)
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Default Re: Critter Identification

Quote:
Originally Posted by jatcar95 View Post
Thanks @Karen in San Jose. I removed that one from the tank when I was taking pictures. I'd seen another at some point, but it seems to be gone now. Makes sense that they came in with the blackworms!
Very cool video by the way! Really shows how they move around, which is fascinating, I think.
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