Are these Obelia hydroids? The mini-tank has saltwater, algae, and sand from the Black Sea. I suspect the algae-like thing on bottom left might have been an Obelia colony that spawned these.
Are these Obelia hydroids? The mini-tank has saltwater, algae, and sand from the Black Sea. I suspect the algae-like thing on bottom left might have been an Obelia colony that spawned these.
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Take a look at this video and see if they compare:
[https://www.reddit.com/r/bizzariums/comments/1agr400/lots_of_hydroid_medusa_jellyfish_in_my_almost_1/](https://www.reddit.com/r/bizzariums/comments/1agr400/lots_of_hydroid_medusa_jellyfish_in_my_almost_1/)