Are They All Too Greedy?

[angelfishguy]

i got 6 silver dollars last weekend and i got them vegtable flakes.
they are in with a flowerhorn..

the thing is everytime i feed the tank i put abit of normal flakes in, the vegi flakes and hikari excel pellets for the FH..
the thing is the silver dollars eat the hikari pellets aswell and everytime they eat one it looks like they have buoyancy issues for an hour or 2 after.. ive tried putting the pellets in one at a time right beside the FH but they keep getting them..

is their buoyancy issues just from over eating?
ive been doing 15% waterchanges every day..

thanks