It's obvious you haven't read the links in my first post. If you had read them you would know that there is no brine shrimp that grow large enough for your clowns not to be able to eat them
You would also find that brine shrimp are not easy to grow in any meaningful numbers. It is very LABOUR intensive for higher density growing. They can be raised like you are doing, in a bowl with air, but there can't be any great numbers of them in the bowl or you'll be changing the water every day or two.
Flake food will only be of use if you crush it up very fine, and put it in a blender for a bit to micronize the size particles. I have never seen the emerald entre but suspect again, it is too large for brine to ingest.
The best food you can feed the nauplii and adults is phytoplankton which you can grow quite easy once you have a starter culture.
The next easiest is to use cryo pastes of algae like nano tetraselmis or a blend like Tahitian Blend from Brine Shrimp Direct.
BRINE SHRIMP DIRECT
You can also make a "ball" like the spirulina ball I mention on my Raising Brine Shrimp to Adult in the link above. This will fog your flake food small enough for the brine to be able to eat if you use a dense enough piece of cloth.
You do not have to stop aeration as the brine merely capture food as it passes by them while everything is in motion.
Because they do for the most part only eat micronized particles of food, they will not work
as a clean up crew.
Check your local fish stores to find one that sells live adult brine shrimp and put them in your tank and you'll see just how good they will work as cleanup crew.
If no one sells them in your area, you can order from Live Brine Shrimp.com
LIVE BRINE SHIMP - click here and scroll down the page
While I have shrimp in my reef tanks, I do not have hermits and crabs at all, but I do have serpent stars which in my case are the greatest scavengers in my tanks.