I don't know about your gars but almost all mine will eat foods off the bottom of the tank without any issues.
As far as rays and gars. I have had 2 rays with gars. The first one, a male motoro kept getting it's disc nipped by the cubans gars. The second again a motoro and again with the cubans was not bothered by the gars at all. In both instances they were short term tankmates.
Well she said the aggression comes from feeding when the garland rays are competing for food off the bottom. If you we're to switch the gars onto floating pellets then it would eliminate the competitiveness between rays and gar. Rays would stay on the bottom for feeding and gars would stay at the top for feeding.
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