I'd suggest feeding some Aquamax 5D01 fry crumble, or 5D02 (Purina's smallest pellet) if you put in a feeder. If you decide to treat with Alum, you'll quickly get a good growth on phytoplankton and macrophytes established from the good light penetration and freshly released nutrients from the dirt work.
You can expect a considerable amount of FA too in your first year or two. It will be a benefit in growing your young fish stock!
