The rule of thumb is that test should be greater than or equal to the deca. This practice helps avoid some of the sides from deca...namely deca dick. When the boys from the old school...like arnold, always had access to testE, but when these new drugs hit the market...hey something new...it must be great...screw testE. They did dbol only then the real fad was when deca came out.Deca dbol cycles, were wrecking their sex lives, and they did not like the sides. Introducing back that stupid old fashion testE alleviated the symptoms. Just like anything else, everyone s different, and some do not follow the rule with no ramifications. It is best not to let the deca get too far away from the test.