not in the main tank, but a small bucket i loaded with nutrients and some algae to start farming it for flagfish
been there a couple weeks since i started it up
just looked today and saw hydra everywhere
haven't put any of the algae in the main tank, so no worries about contaminating the main tank
but ...
what do i do about the bucket ?, how do you get rid of hydra ?
best i am familiar nothing eats them due to their poisonous stingy tentacles (sounds like saltwater sea anemones don't they
i could be wrong that nothing eats them, ... but still, hydra everywhere in that bucket 
i'm sure this question has been asked dozens of times on forums all over, but i'm asking again here.
been there a couple weeks since i started it up
just looked today and saw hydra everywhere
haven't put any of the algae in the main tank, so no worries about contaminating the main tank
but ...
what do i do about the bucket ?, how do you get rid of hydra ?
best i am familiar nothing eats them due to their poisonous stingy tentacles (sounds like saltwater sea anemones don't they
i'm sure this question has been asked dozens of times on forums all over, but i'm asking again here.