Aphids, aphids, everywhere

[onthefly]

Anyone have a sure-fire recipe to kills these little suckers? Need something completely tox/chem free as the infestation is in our hydroponic set up connected to fish tank, so can't risk killing the trout.
We've tried a garlic spray, but not working too well. Also put up sticky strips to catch them... Can't get ladybugs to stay out there...

[Winter]

You need ladybugs Marcey, can you plant a ladybug friendly plant nearby? My friend has a grevillia that is covered in ladybugs, they just love it for some reason.

[nic]

Could you try companion planting something nearby? I think marigolds are good for aphids aren't they?

[onthefly]

A grevillia, huh? ok, will see if we can try that, thanks

Nic - they LOVE the marigolds best of all I think