Well estrogen is usually the culprit when it comes to fusing the epiphyseal plates. EQ aromatizes minimally, but that's still an increase in estrogen so an anti aromatase or anti-e would be beneficial. This may be a moot point though, BigCat over at bb.com says any stimulation of the androgen receptors signals the growth plates to close. So if that statement is true then any steroid would stunt growth. He's the only person I've heard that from though. I would be interested to hear from any knowledgable guys here about that issue. It's enough to stop me from juicing for a few years as I still have some potential growth myself.
This leads to the real question. How old are you and what are your stats? If you have to ask this question it usually means you should stay away from AAS until you're finished growing.