Hi. My son just bought a Russian tortoise and I am not sure we are caring for it properly. His tank is a 2x4 plastic tub and my son built a second level for him. Substrate is a mix of playsand and coconut coir with repti bark on top level. He has a little water dish and we soak him every other week or so. He has a basking spot around 90 degrees, a warm area with hide and a cool area (70 degrees) under second level. He has a uvb light too. We feed him spring mix salad, cactus pad, and other greens and dust them once a month in a crushed tums. Is this good care? Is the second level too low for him? Will he escape?