You can run it next cycle after you are completely recovered, Do not add it to this one Deca can be a bitch to recover from for alot of people.I would go with Tren Ace If it starts giving you problems the short ester will have it out of your system quickly.
The right way? Pct properly, then time on+time off, then tren.
The wrong way? Jump right on the tren mid cycle.
I've done both(albeit with npp) and the former gave better gains and sense of health, tho the latter satisfied the "juice head" in me, i felt like shit and couldn't wait to get off two weeks into tren