Is this Ca def. or what?

[RedEye69]

Try his thread and see if it helps....International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

That looks like too much of something to me rather than not enough of something.

Yea, that guide is what made me think it is Ca. Hmmm, your second statement made me think, so I checked the TDS inside the rockwool and it was over 2000 (my meters max).So I think maybe I should flush rockwool with plain water.