I was researching various fruits and vegetables that I can feed to my crickets to make them extra healthy for my frogs. I came upon this thread (on another site) that says you shouldn't feed them spinach because it's high in oxalates. Something about it causing kidney damage among other things. Is this true? I have been feeding my crickets carrots, romaine, spinach, potatoes, broccoli, apples, grapes, cantaloupe and the recipe off of this site. Have I harmed my frogs by feeding the crickets spinach? I tried reading up on oxalates, on wikipedia, but it is very confusing.