i have a 10" motoro female ray she is housed in a 250 gallon tank 96"x30"x24" the water condition is as follows nitrate 0 nitirte 0 ammonia 0 ph 8.2 ive had her for over a year she has alway ate earth worms cut shrimp or crayfish that i raise myself. she has suddenly quite eating its been over a week since she has ate normally the behavior started when i did a 50% water change which i do twice a week i will sometimes put a worm or a few crayfish in her tank at night and in the morning there gone but not always i would say at best she is eating a worm a day she is still active she has gone on hunger stikes in the past but never more than two days she is starting to get skinny any suggestions on what to do if it matters the filteration is a wet dry filter with 50 gallon sump with a 2000 gph pump and a fx5 the water temp is 79