Leaf tips and edges help

Started on the 1st and 2nd leaves tips and edges turned brown/rust colored then started spotting the leaves, picture of later stage damage yellowing spread across leaf margins leaves drying out. This happened after using Maxicorp liquid seaweed. My initial thought was salt build up. Have flushed with PH'd water 6.2 approx 1.5 gallons each. After soil has dried have resumed light feeding. Looking to see if anyone sees something else in this. New to using soil less mix and chem nutes.

This is Blue Mystic showed up on the 1st and 2nd leaves then started near top of canopy off the 2nd branching.



This is Yumboldt 47 has the worst damage showed up very quickly on the 1st 2nd and starting on 3rd also some spots on some of the branching.




The Facts

Medium - Sunshine 4 mix with additional approx 30% Perelite
First Feeding - 4 weeks at 300 ppm over water 6.1 PH
Water - Tap water 140 ppm,
Run off - 5.7-6.1

Might be a magnesium deficiency.

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Click the pic 2x to view it full size.

Up your nutrients. You have multiple deficiencies based on the picture of the whole plants.

Yeah think it was caused by the seaweed mostly K which hard to overdose on but thinking that s locking out my micros zinc , mag, cal. I made the mistake and followed recommended mix have used it on other plants (orchids, spinach, micro avocado tree) that way without problems but they are also more established. Using it now at 2ml per liter seeing if that takes better.

If you've only fed them a 300 ppm mix, then yeah, up your strength a bit. You will never OD your plants with K if you feed it a mix @ only 300 ppm. Most plants have a K tolerance of 700 ppm, by itself!

From what I see, Calcium lockout/def is causing the polka dots.

Up your strength to about 600 ppm with a balanced fert, with a splash of that seaweed shit.

Note-- seaweed has sodium in it, which can displace the minor elements.

make sense?

Yeah using 2 part GH (well 3 part sorta use 50/50 mix of micro and micro hw) when feeding then on watering seaweed, like i said followed the directions minus some when mixing it up but seemed strong would have to go back and see what ppm is at recommended dosage now using it 2ml per liter. I gave them the flush after seaweed because thinking was toxic salt build up, have medium water here and plus not sure what the sodium content of the seaweed is. Sodium represent about 10-20% of the ppm in the water here. In the future plan on going with RO but do not have the money for it right now, already have exceeded my budget as of lately.

Water report 2009
Total PPM L 58 H140
Calcium L 13 H37
Magnesium L 6.3 H11
Sodium L 6.9 H 32