the Ray will eat the BGK. and 70g is kinda small for a FW ray.
The shorter and wider well basically the more surface area at substrate level you can have the better for them. They love shallow vast environments. but yep the BGK will be a mear snack for a bigger FW and a meal for a smaller FW
Actually, you can keep a BGK with a ray. Your problem is your tank size. Motoro's at minimum require a footprint of 6x3x2 which is ~ 270g. The smaller rays (retics) can be in a minimum of 6x2x2 which is ~ 180g
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