bubbles in my water...

hey guys ive been using the
general hydroponics waterfarm 8pack
ive made them all into individuals instead of using
a reservoir....just started today but when i looked into
my pebbles theres bubbles all over..i dont get why
this is happening and am wondering what should i do to
fix it....thank you for all your guys help.kiss-ass

wash off your grow medium and change you water, if that doesn't help get a new airstone