I have realized I only feed my toad earthworms. I feed them some beetles and grasshoppers in the summer, but not enough that they eat it regularly. So they really only eat earthworms. I don't have the money to buy vitamins for them, so I put them next to a window (The sun isn't directly in the view of the window) for them to get vitamin D from the sun. Is this bad that they're main diet is only worms?