I have 2 motoro stingrays in a 220 gallon, 6 inch male and 12 inch female. A 12 inch silver arowana and 9 giant danios. I have been feeding 8 massivore delite discs twice a day, lightly breaking them up. The silver typically gets one or less per feeding the small ray gets about 2 and the big ray eats the rest, about 5. It is gone in a minute and they would probably eat much more. 78 degrees and they are active all day, very active at feeding time. Waste levels are steady zeros changing 80 gallons per week.
Just looking for any advise on what has worked for others. I am planning to add a third larger tank in my woodshop for when they get bigger, 400 to 600 gallons. Any questions are welcome.
Just looking for any advise on what has worked for others. I am planning to add a third larger tank in my woodshop for when they get bigger, 400 to 600 gallons. Any questions are welcome.

