if i have 2 astral herons on a bf, played my first card to float the trigger, can i use a reaction speed card to claim the discount of heron 1 and use another card for discount 2 is there any limitations of this and where are the windows where my opp can respond is the triggered ability of heron able to be reacted to or is it an invisible trigger if so can i react to my own trigger is the 2nd card in trying to get a discount for even legal since it says next card and technically would come after the reaction speed card

Yes — you can split the two Heron discounts, but only by playing that Reaction card in the gap between the two triggers resolving; if you don't use that gap, both discounts land on the same single card (FAQ #11679).

First, a correction on timing: the trigger fires when your first card finishes resolving, not when it's played (Rule 419.4.a), so there's nothing "floated" while that card is still on the chain. Once it resolves, both Herons trigger — two separate chain items, added together but resolved one at a time. After the first one resolves, the second is still on the chain, you control it, and you regain priority (Rule 340.4). That is your window: play a Reaction-timed card there and it gets the discount of the Heron trigger that already resolved; the second trigger then resolves and its discount is left for your next card. Limitations: the mid-chain card must genuinely be legally timed (Reaction / Quick-Draw, since you're in a Closed State), each discount is mandatory and one-shot — you can't play a cheap card first and "save" it for your big one — it expires at end of turn, and Energy/Power can't go below 0, so the [A][A] portion is wasted on a card with no Power cost.

The trigger is not invisible: triggered abilities are placed on the chain as normal chain items and the accountable player must announce them (Rule 383.3; Tournament Rule 506.3), so opponents see them and can respond with Reaction-timed cards/abilities. You can act while your own trigger is on the chain — that's exactly the play above — you just can't "counter" your own trigger (no reason to).

"The next card you play this turn" means whatever card you play next after that trigger resolves, so yes, your later card is legal and an intervening Reaction card doesn't disqualify it — it simply becomes the discounted card if it was played while the discount was live (play it before that trigger resolves and it isn't discounted; play it after and it eats the discount).

Opponent's windows: countering your first card (which stops both triggers), while the Heron triggers sit on the chain (killing a Heron there does not cancel an already-created discount — FAQ #11869), and in response to your Reaction card. Priority between the two trigger resolutions stays with you, so they don't get that window for free.