Run off color

I am growing 6 plants about half of them have a light yellow run-off the other 3 have a dark brown color to it. Is this an issue? Is the coco not packed tightly enough in some?

I am growing in Coco/perlite.

PH 5.9

Was your coco prerinsed? If not did you rinse it? Is it recycled? Doing anything different to them?

I had both a bag of coco and a bricks. I soaked them mixed it with perlite loaded the pots and then let them drain once. I then transferred the plants and watered them.

3 of the pots were mostly coco from a bag mixed with perlite. The other 3 were coco from brick and perlite.

The 3 from the bag were rinsed, the brick wasn't. So you have darker runoff from the 3 from the brick. You should have rinsed it till it was clear, but its not that big a deal. If watering to a little runoff it'll balance out. Might affect the pH or salt content of the runoff. You can just flush it if it causes problems, but I doubt it will.

I am not sure if the curling is in the dark run off plants but, if it is should I flush them? Could that be causing the curling? Since, the curling may also be from over watering I fear that flushing them may make it worse. Any opinions?

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Thought I commented on those pics on another thread. Your plants look pretty green and healthy other than the curl so I think it's just too wet. Let em dry out some between watering. Let them get light to the lift before watering. The top 1/2 inch or so should be dry, but I like to just feel for it. Compare a saturated one to a drier one for reference. You don't want it to be dehydrated, but don't keep it soaked either.

I test the runoff with a ppm meter and ph. Gives me a better idea than color.