recently purchest some wild caught rays two are nice and fat ann eating well the other one eats small amounts and is very skinny and when it craps its very light in colour and does not come out fully it takes a wile to detach
crap that is light in color is questionable to all fish... is it a light brown? or a pasty white... if its pasty white thats a internal parasite. if its light brown it may just be the food.