I have a 210 gal with albino ck mono pbass datnoid and motoro ray and a silver aro I just did about 40% water changed and my aro hasn't ate in 3 days after water changed but all others are eating just fine upload a pic of my water parimeters
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If all of the other fish are eatting it should be ok. rays are really sensitive, so I would think if there was something wrong with the water the ray would stop too. But aro do funny stuff like this and might just not be in the mood to eat. they can go awile with out eatting. have you tryed the basic food that they normaly eat at petstores and in the wiled like crikets or bugs even worms. small things like that might not fill him up but he gets back into the habbit of eatting.but dont stress too much cuz he might just need another day and will eat tomorrow or so. If it gose past aweek and ahalf then you might wanna try something new.but if eveyone is doing just fine then I beleave hill eat when hes ready.
I have ran into this problem time and time again with my big boys... Almost intimidated by the top of the water... Try hanging some night crawlers in the top of the water... And watch out for your fingers...
