i wouldnt dare to put the larvae or post larval clowns in your established nano, they will wipe it out (between the food and the waste. you have to keep a very high food density and the water quality ends up being just terrible...which is ok for the clowns but not for anything else.) I second the fact you will need a separate rearing tank, and double second the fact that you need to get Joyce Wilkersons book in order to have 'the full picture' before you start. dont worry, if your clowns are laying, you will have many more clutches of eggs to raise in the future. dont feel like you have to raise this clutch. good luck!