Deca and EQ have almost the exact same anabolic properties. Using both in the same cycle is almost the equivilant of using Drol and D-bol in the same cycle (w/out the negative effects on the liver). I would definently not use both in the same cycle. Use the EQ and save the deca for later, when your doing a cutting cycle. Deca is a little more receptive to cutting agents then EQ. Of course, this is just my own personal experience, each persons body is different. One thing that I do know is that you don't want to use EQ and Deca in the same cycle, that is a waste of money. Good luck on the cycle bro!