Hello and welcome to FF Emily! If Leopard frog or any similar Ranas, you can use the information on this care article: Frog Forum - Leopard Frog Care - Rana pipiens (Schreber, 1782) and R. sphenocephala (1886) . Most Ranas will do well in a 60-75% water tank with smaller dry side simulating a shore. Can get many ideas in the Vivarium section from other member projects. You can vary the diet and add following if available: blackworms (usually live), daphnia (frozen), large FF (think are Hydei), and cut up (from pointy end around size of frog length) earthworms (available in bait & tackle sport stores, get with no dyes or chemicals). Recommend dusting with CA/D3 2X and vitamins 1X weekly on different days and with skip day in between. Since your frog will live mostly in the water, now is the time to train it to eat on a little glass dish or bowl in the dry area. Feeding aquatic frogs dusted animals is a challenge; but can be done with adults by injecting a supplement solution into larger night crawlers before dropping in tank. Good luck !

A filter will help greatly with maintenance and keeping ammonia and nitrites on check. In the meantime, change 25% daily with same temperature dechlorinated tap or bottled spring. Once filter is cycled (around 30 days but can cut in half using a product like Seachem Stability); you can change 25% or so weekly. When doing water change clean filter media in tank water and do not replace all the media at the same time or you will have a mini cycle again until new media is seeded. Good luck !