Sorry, friends that I post exactly here but I don't even know what to do
Recently some odd things appeared in my aquarium, and I don't even know if they're dangerous...
Please, advise me what to do?
Recently some odd things appeared in my aquarium, and I don't even know if they're dangerous...
Please, advise me what to do?
![](https://tag-qgv8rvci.netdna-ssl.com/wp-content/uploads/2018/06/bristle-worm-600x400.jpg)
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