Anyone Use Koralia Evo Pumps on a Neptune Apex?

[viperfish]

I'm trying to set up my Koralia Evolution powerheads as a wavemaker on my Neptune Apex. My problem is the OSC command works fine on one of the Evo's just fine but the other one will not cycle. I even tried to manually turn off the PH but no response. Why would it control one just fine and not the other. I have read that sometimes the Apex cannot sense very low voltage and therefore has trouble controlling some equipment but I have never heard this with a PH. I am using my relay switched outlets for my dosing pumps because I cannot afford to miss dosing cycles. I'm getting very frustrated with this Apex! I'm wondering if I would have been better off with the RKE!