WW Mg def?, K def?

Help! Please this is the second round of WW I have run. The older fan leaves get slight rusty spots and progress to yellowing, the last run I wasn't able to correct the prob in time, this time I hope I can. Here is the lowdown......

Hybrid Aeroflo2 setup

temp of res is 64 to 75 F.(max)

700ppm(1.4ec)

5.5-5.9ph

Ro H2o

GH lucass formula, adding diamond nectar florablend and floralicious plus, I have also been foliar feeding with HN sea-mag at a rate of 3ml per gallon, and SSU at 2 ml per gallon(this was based on a recomendation from staff at Green Triangle, who also worked with Humboldt Nutrients recently) BTW these people seem to really care about their customers and products as well and are not trying to "sell" you. My last harvest was the first time I tried their products(purple max SSU and gravity) I will say that 1 strain I have been growing I almost gave up on due to lack of density, but after using gravity she will be grown again! Sorry to ramble but I can't speak highly enough of these products, or the people behind them!

Any input on this matter will be greatly appreciated!

I believe its a Mg/Ca issue. I had the issue really bad and upped the nutrients and the issue went away. However, its back now that I am a little over half way done with flowering. But just going to hit them again, and keep on rolling.

I'm not a hydro grower at all, but 700ppm seems fairly low, low enough to eliminate any over feeding issues in my mind.

Thank you for your input The Bone1234, I have been running my nutes a tad low but last run they were higher and I had the same issue. I wondered about Ca as well, I do use RO water. If anyone knows of any Ca issues with the Lucass program, or has any insight please post, I would like to get this under control ASAP, as this should be my best harvest to date if I can get things back on track.

Oh yeah, I am also growing a Kush plant using the same resevoir and that plant isn't showing any signs of this?

Been having the same problem. Let me know if you find the solution.