suds in my reservoir

First off thanks to RIU for all the help on my previous grows even got 12 zips off one plants a couple months back. But this was in soil and under 1000w hps. Recently I changed to hydro due to well let's face it soil is a mess, and dropped down to a 600watt hps I am wondering if anyone has ever had this problem before. I have kinda like suds in on of my buckets. Ph is steady at 6.0 ppm for this little guy is around 350 I'm trying my hand at mainlining. Using Gh organics and just can't figure out why I'm having this problem. All other ladies are doing well. Any info would be greatly appreciated.

Check for light leaks.

If it doesn't smell you're on the winning side.

How does the roots look?

Nice and white with no smell

Happens in my buckets as well

Dont sweat it. But do check for light leaks

this happend to me the problem was the water temp to low check that out maybe that solves your problem as well