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I'd really hope the city water is not full of harmful bacteria... That usually makes the news.

Regardless, some places spray with all sorts of nasty stuff when the plants come off the truck, some require they be sprayed at the wholesaler before they even go on the truck, and if you are growing in the volume needed to supply the big box stores, you are spraying with all sorts of nasty stuff on a pretty regular basis to begin with. In other words, patience, grasshopper. Washing the plants will get rid of surface nastiness, but the systemic pesticides just take time.

I usually suggest you wait at least a month if you can. Set up the tank, get the plants in, maybe some springtails or other invertebrates, and let it settle. The tank will probably grow some mold, kill some mold, grow something else weird, kill that... eventually it will reach an equilibrium.
 
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