My first hydroponic projects. Cos Lettuce. Aquasol plant food

I have recently ventured into a small hydroponic project. I got some perlite, a few net cups, recycled milk bottles, aluminium foil sheets and aquasol plant food to get the project started.

A few cos lettuce seedlings have been transferred to the hydroponic setup and they seem to be responding well so far. 

Photos of 2 weeks old seedlings.