Do Omega-3 Oils make a difference?

I recently started my kids on a regimen of Gummy Fish, which are omega-3 oils disguised as fish-shaped candy, similar to gummy fish, except healthy for kids. I did this because I read that kids who are over-active can benefit from having more omega-3's in their diets. We eat fish already, so I have been eager to see if it works to help calm them down. Time will tell!