They don't look quite right for hydra(I've had those) but you never know. Hydra usually attach themselves to something solid and wave their arms in the air. Well, water.
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If they are midge flies they are at a stage that Iāve never seen. I have had midge flies in my tanks and they donāt look a thing like this. The larvae are red blood worms. You will find them in your filter media. The fly itself looks like a small fly and will fly out when you lift your lid. Believe me, Iāve experienced them a couple of times in the Spring due to my pond being close to my back door. The pic above is a midge fly. Again, if yours are midge flies then Iāve never seen at that stage. Once they get past the blood worm stage, they canāt breathe in the water. Are yours surviving in water? Perhaps Iāve never seen this stage because my fish eat them as blood worms. Poor midges donāt have a chance.hydra don't have legs. hydra are related to sea anemones and look like coral polyps.
they are a midge larvae