So i've got my full school of cory's!

and they are a bit trickier to feed b/c they don't just swallow the food like tetra's can with flakes.

i've got 10 cory's (spotted cory's to be exact)
i use hikari sinking wafters for their main diet.
As they are mini wafer's-the rule of thumb for "feed as much as they eat in 3 minutes" can't apply?

so how many wafers would you recommend dropping in for 10 corys?
(also, my bolivian rams LOVE these things)