I have the suspiscion that our dwc tubs are poisoning our plants. They will be three wks flower tomorrow.

Some of the fan leaves are going yellow with a very red tinge to the edges of the leaf. It seems indiscriminate as to where these leaves are on the plant.

At first I thought it may be a problem with the fert's, but we have a fish tank set up the same way and, apart from dropping a heavy light on them and having to sellotape and tie them up a few days ago, they are fine.

I don't know if the plastic tubs are upvc, and I don't want to correct a nute problem that isn't there. Also, the fish tank is ok.

I'm wondering if anybody has experience of this?

LOL. Just got back from the grow now, and it turns out to be a nute deficiency. Nitrogen and maybe a little manganese. So I've given them a dose of sensi grow part A. Should see the problem righted in the next few days.

We just flushed for too long. Anyway, sorry for confusing the hell out of anybody reading this thread and trying to think of a way to help. I hadn't actually seen the problem, it SOUNDED really bad.