I thought I'd post a pic of the dish I use. As I mentioned before its actually a Large or Xtra Large "feeding dish" by Exo Terra I bought from Petsmart. The Feeding dishes are nice because they are shallower than the water ones. As you can see 3 of mine will easily fit without bugging the other. Greens are usually a bit bigger up to an inch longer than Greys. So it should still be enough for your 2 XD! Very quick and easy to change everyday too!