Looks like vorticella, a microorganism. It eats bacteria and helps purify the water. It’s pretty smart actually. In the wild, they can detach and reattach if the conditions are not right. I wouldn’t worry unless it starts getting out of control. Do you have a shrimp or living things in the tank? It won’t harm them as long as it doesn’t grow out of control (too much bacteria)
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Looks like vorticella, a microorganism. It eats bacteria and helps purify the water. It’s pretty smart actually. In the wild, they can detach and reattach if the conditions are not right. I wouldn’t worry unless it starts getting out of control. Do you have a shrimp or living things in the tank? It won’t harm them as long as it doesn’t grow out of control (too much bacteria)
Bryazoan colony ?
Seems to be a picture