It'll still cause hair loss if your prone to MPB, to what degree depends on how aggressive your hair loss is.
If you were running fin or dut (obviously you can't because you're running deca), that low of a dosage would probably cause very little harm. Since your not, you won't know until you try. You may want to run prop (if you don't mind the injections) rather than enth, cyp, or sustanon. Atleast with prop, you could discontinue use (or lower the dose) if the fallout became too bad and not have to worry about it being in your system for a couple more weeks.
Besides nizoral I would definitely get some topical spiro.