The recommended dosage is 4 ml Alga Grow per liter water (1:250). So I wouldn't expect it to bring such a reaction, Ec is within range as there is no dmg on tips, osmosis doesn't give you a choice, doesn't mean the ratio isn't skewed though on something, hmmm Alga grow NPK is 4:2:4, not recommended for veg tbh try stick to something more 3:1:1 or 4:2:1, excess potassium can cause problems as it blocks absorption of calcium, magnesium, and iron. The yellowing from the inside out looks similar to K toxicity. Possible but not sure, PH would help. Good luck.