I got my 25 on the group buy but it is too strong for my 21 gal tank.i have been researching hooking it upto my apex so that I can turn it way down,I bought a reef angel cable,my question is whether I need a vdm for the apex to make this work? I just bought the wxm at macna to control my vortech mp 10's which I am very happy with.if I have to buy the vdm I think I'll sell the jaebo and just buy another mp10