Hmmmm, i feed my snakes out or their enclosure and in a glass tank all the time BECAUSE::: 1-I don't like having to clean their enclosures of rat droppings and urine<-- which is very toxic every time i feed them and 2-gives them a easier eating plans oh yeah and 3-(Don't want my snakes swallowing any substrate from their enclosure, better to be safe than sorry..)