Today looking at my 29g tank I noticed two little hitchhikers in the tank (snails) and then noticed these things. Are they harmful? 
What is this thing in my tank
- Thread starter Rtc/tsn
- Start date
Hydra
www.thesprucepets.com
A Hydra in My Aquarium! What Now?
A Hydra is a soft-bodied freshwater polyp that is sometimes accidentally introduced to freshwater aquariums. Here is how to get rid of them.
What’s it do? It looks cool but are they harmful and how’d it get in the tankHydra
A Hydra in My Aquarium! What Now?
A Hydra is a soft-bodied freshwater polyp that is sometimes accidentally introduced to freshwater aquariums. Here is how to get rid of them.
I made it easy for you so that you wouldn't have to use Google. Did you not read the link that I posted? It's just sitting there in the quote and the post that I made. Post #2, right below your original post
For me it only popped up with what they are but didn’t give anything else. I’ll restart my phone and see if it’s different
There's at least 2 paragraphs that answer your questions within the link.
Read the website. Use your thumb or finger to click on the link
