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deficiency? What's missing?

I'm having trouble with some deficiency - trying
to track it down. The only plants that seem to
be affected are ludwigia arcuata and ammania gracilis.

Heres a picture of the ludwigia..

In Ammania graclilis, on SOME stems the growing tip is crumpled.
I'm thinking calcium - but I do have some crushed coral in my filter.

Any ideas?