Help! GDP not looking so great..

hey guys, i haven't done GDPs in awhile and decided to go back to them. well it's been 2 weeks in veg and they're starting to look rough. i'm doing dwc and my ppm started at 350 and the 2nd week i bumped it up to 550. for some reason my plants are stunned and the roots stopped growing. the roots has a tint of yellow but are still hard and not mushy like it's rotted at all. no nasty smell or anything close to rot. what could be the problem? here's some pics! thanks in advance

Well grats. You're the first person I've seen in at least a month with a genuine Iron deficiency. Typically only seen in hydro, that's what causes the odd yellowing your plants are having that gets greener towards the tips. Blood Meal is the best source of Fe and can be made into a tea for use in hydro.

Hey mother's finest! thanks for the quick reply bro. is there anything else that'll work where i dont have to make into tea? what else you recommend me feeding it to fixed this Fe deficiency? i just did a water change out and right now i'm not feeding it anything but plain ro water to be safe. you think i should still give it it's regular veg nutes? thanks mate..

There's Maxicrop seaweed +Iron which is very good stuff. It's a great foliar feed as well. It may be a little hard to find locally, though. That's about the only strong source of liquid Fe we've used but I'm sure if you asked a hydro store, they'd have a few Iron-containing options.

Feeding plants nutrients they're deficient in is never a bad idea. Root growth should pick up when they get some Iron. Aside fom the Fe situation, the plants really look quite nice and so I don't want to make too many suggestions when you seem to already have most of it under control.

thx brotha! i actually just bought some spray and gro and foliar fed them. how long you think it'll take for these babies to recover? and does the yellow eventually turn back green or i have to wait for new growth? thanks again!!