I keep a spotted gar with a pair of motoros and a few other fish and have no issues. My gar only stays at the top of the tank except for at night. When I wake up I see him sitting on the sand and the rays don't show any interest in him. The smallest hint of light and the gar rises to the top. Feeding time is no problem. The gar only eats in the top left side of the tank. I use a 3 foot piece of PVC piping to feed the rays to make sure they each get a good amount. The rest of the fish are hand fed or fed pellets. No major issues with feeding or compatibility.
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