Are you referring to ActX doing this or SDNG? ActX or MassFX would both do this. SDNG is a mild PH/stim combination.
To answer the OP, yes, you can stack ActX and SDNG, but the follow-up PCT would not need to be anything more than aPCT. No need for a SERM like Nolvadex, or even the commonly mistaken and misspelled Gaspari product NovodexXT (I bet I even spelled it wrong, didn't I?). At any rate, aPCT is it. And that's only if you are taking SDNG at 4/day. IF you wanted to get the stims from it and not the PH affects, just knock it down to 2/day used pre-w/o on w/o days only. If done that way, not only will the bottle last longer, but you'll have no need for any sort of PCT.