You can use that tank (especially if the crestie is young) but it could easily become too top heavy and tip over. If you choose to use a UVB light or need a heat light, cant really do it with a tipped tank. Also before I got my exo terra 18x18x24, I had a ten gallon and turned it longside up. It became a real pain to open and close the screen with the clip locks. Better to have a glass tank then a mesh tank so humidity stays in, but depends where you live. Zoo Med and Exo Terra make 12x12x18 and 18x18x24 inch tanks. The smaller tank is more affordable but the bigger one you will be happier you got. I got my exo terra on craigslist for $40. Usually you see them for $75 on CL or $100 at the store. As for food, Repashy crested gecko diet or Clarks. You can only get them on line, but it will last a while, you just need a dab at a time. Amazon sells it. You may find TRex brand (which is from repashy I think) at the pet stores, but it is more costly in the long run and I think cresties like the other stuff better. I learned alot looking at crested geckos on you tube. You really learn the difference between good set ups and bad ones! Good luck.
