Ah, I didn't know you had some in your tapwater.
You have traces of nitrite in your tap? Or nitrate?
Either way, I doubt the behaviour is caused by the water quality given those numbers. May have just been an itch, or a random cory thing that we will never understand, but if you can't see signs of anything else to worry about, then yep, I'd just leave them be for the night and keep a closer eye on them over the next few days, keep an eye out for any other signs. But don't be too paranoid either, okay? Doesn't sound like you need to panic at this stage, might be nothing
Right, super late here and I'm shattered and off to bed. Have a good evening you young whippersnapper, you. Do your homework too.
