a cage top is very usefull it helps alot for trapping heat. peatmoss is good but because the baby is still small sometimes the moss is accidentally swallowed and causes impaction which results in death.wait till the frog is a juvenile. a Iight is not needed but if you dont have any source of heat you might want to use a low watt heating one or use a UTH. a regular calcium supplement for reptiles is fine i personally use jurrassi cal.