I will try do daily water changes for a week to see if its gone.
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The only thing that smells were elodea, surprisingly the water doesn't smell, weird.
It must be that the plants absorb various things cause, there's no filter in that tank and is a Walstad method...
oh gosh...I've never had an egg smell, but I did have a plant die that smelled like cow manure when I removed it.
There was also no abnormal smell to the water.