You seem pretty handy with DIY.For the light,maybe build a hood for it.The rock may have already been cycled when you got it,so only a small cycle in the tank from the bit of die off,from the trip home.Best to wait a while to make sure,and good idea getting you water tested at a store.Check out the Royal Grammas for a fish,colorfull (wifes like color
)and easy to care for.