Here are a two sling containers, as an exampleIt really does depend if you are getting a sling, a juvenile, or an adult T. That's an 11 Liter tank, just shy of 3 gallons. MUCH too big for a sling or 2 inch juvie, fine for an adult. Don't want too, too much space for a sling, otherwise you'll have a hard time tracking where it goes and your sling will have trouble hunting food with so much room to run around.