Silversides are too big IMO, mysid would be the food of choice and as about as big as you want to give em. Takes a couple minutes for them to choke one down and if the portion is too big it will take more time and more than likely not make it's gullet as a hermit, or shrimp will be quick to take the candy from your babies.
Between the two blasto and acan, I would feel more inclined to feed the blasto directly. Acans do fine left alone, but of course with good feeding and good water they will grow faster, but I think it's more important with Blasto's. Health and growth are actually noticeable with frequent feedings, which normally blastos are painfully slow growers.
I would just feed once a week since the tank is new, after 3-4 weeks being able to keep a handle on water quality then you may want to consider vamping it up to 2x a week. Basically what I shoot for is 'heavy feeding and heavy exportation', just can't have one without the other though.
Good luck with your new pieces!
-Justin
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Proud member of M.A.R.S Marine Aquarist Rountable of Sacramento since Apr.'05
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