It's not difficult to mod most any feeder to be controlled by apex. Could do it off a power port or vdm."]
You have steps to do this? Most feeders I have seen are run off batteries you just cut leads and run them to variable port?
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There are a couple of topics on the RA forums explaining how to do it but it's essentially switch it to power from external source and control the power by with the energy bar. I think it could be done easier by using a transistor hooked up to the manual feed button and then momentarily pull a pin high to simulate the button press. I'm not sure how you do that with the apex but I think the breakout module should allow you to do so.
I found this guide on manhattan reefs forum for the eheim. Should be able to adapt to most any feeder. http://www.manhattanreefs.com/forum/diy-do-yourself/126777-successfully-hooked-eheim-feeder-up-apex.html#post1177927