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the camera should definitely have an IR cut filter - ZWO make one that chops off at 700nm. The Bayer filters stop working properly above 700nm (see the QE graphs on the ZWO page) and that will mess up the colour saturation, so the ZWO filter would be a good choice. It will have no other effect on the image, so put it in the train at the most convenient point - best after the OAG though, since it will stop some IR light that your OAG can use.
My QHY8 has an IR cut filter in the nosepiece and your 60Da will have one built in.
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