delphinus Posted April 20, 2007 Report Share Posted April 20, 2007 So I have some kind of mysterious critter in my new FW tank ... some kind of hydroid I guess. It looks like a miniature anemone (about 1mm in size). Anyone seen anything like this before? Should I remove them or let them be? Quote Link to comment Share on other sites More sharing options...
Vallisneria Posted April 20, 2007 Report Share Posted April 20, 2007 Those are hydra. I've never dealt with them before, so I'm sorry I can't help. Quote Link to comment Share on other sites More sharing options...
Shayesmommy Posted April 20, 2007 Report Share Posted April 20, 2007 I think they are harmless to adult fish, But eat babies They live in really clean tanks. Thats only what i read tho. Not sure about keeping and getting rid of them. I wouldnt want them in a baby tank. Heres a link on hydra http://www.northern.edu/natsource/INVERT1/Hydra1.htm Quote Link to comment Share on other sites More sharing options...
windeindoiel Posted April 20, 2007 Report Share Posted April 20, 2007 Some fish like to snack on them, but I've also heard they like to take down baby fish. If you have no baby fish in that tank I guess it's up to you. If they start getting out of control you might want to do something about them though. Quote Link to comment Share on other sites More sharing options...
werner Posted April 20, 2007 Report Share Posted April 20, 2007 Yeah, not really a concern unless it's a fry tank. They may naturally disappear on their own as suddenly as they came. Just consider it a part of your aquatic ecosystem. Quote Link to comment Share on other sites More sharing options...
Slough Shark Posted April 21, 2007 Report Share Posted April 21, 2007 You should totally keep it!!! We had a small aquarium with lots of these guys in my Science Class, they're soooo neat!! Quote Link to comment Share on other sites More sharing options...
Vallisneria Posted April 21, 2007 Report Share Posted April 21, 2007 How to they develope in the aquarium? Do they have to be introduced? Or if it kind of like algae, it just sort of happens. Quote Link to comment Share on other sites More sharing options...
Slough Shark Posted April 21, 2007 Report Share Posted April 21, 2007 (edited) I think the larvae need to come in on a new plant perhaps. Our class went out to Chickackoo Lake (local lake) and took some water samples, we found some Hydra in the samples under microscope and took them back to our class aquarium. There are two types of Hydra I believe, there is Hydra Fusca and Hydra Viridis, as the name suggests Hydra Viridis is bright green, so you must have Hydra Fusca. Heres a website that will teach you more (I used it to research them in Grade 9) http://www.micrographia.com/specbiol/cnida...zo/hydr0100.htm Google "cnidaria hydra" and you're bound to find plenty of info if you care! Edited April 21, 2007 by Slough Shark Quote Link to comment Share on other sites More sharing options...
syno321 Posted April 22, 2007 Report Share Posted April 22, 2007 It's true they are harmless to most adult fish but I don't think I'd want to accidently introduce them to your ( or a friend's ) baby tank via plants or water. A sure fire way to eradicate them with NO harm to any fish or plants is to double dose a product made by Aquarium Products called Aquari-Sol. I've sometimes had to use this in fry tanks over the years, and had no adverse effects. Quote Link to comment Share on other sites More sharing options...
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