First of all, what the heck is PMDD? It sounds like some kind of mental
illness.<G> Now for some of your questions.
>Is Ferrous Sulphate the result of chelation?
No. Iron(II) Sulfate (ferrous sulfate) is not chelated. It is a simple
soluble iron salt. In a typical aquarium environment the iron will quickly
oxidize to iron(III) and precipitate.
>This product contains Copper.
I don't see why anyone would deliberately add copper to a planted tank.
>What provides the EDTA here?
If this is the complete list of ingredients, nothing.