Are you sure those are hydra? Dead hydra usually curls up into a tiny ball and wouldn't look like a hydra.
Mostly, when a canister is turned off and on, alot of yellowish bacteria film will get ejected. Are you actually seeing this film instead?
I wouldn't recommend copper in a shrimp tank at all. It may get absorbed by the soil and later release when the soil breaks down.
Also, please use some activated carbon before adding shrimp to make sure you get any remaining drugs out of the water.









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