Grow Mediums Aerogarden ultra led Think Different GH nutes

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Hi everyone I also have a TD in an aerogarden and I was worried about it being too small, however it's nothing to do with the height of the lamp. as I have removed the aerogarden one and added a 600w hps in a og parabolic reflector which can be raised whatever height I want. I am worried the resivoir which is about 4 litres is too small for the roots. It's day 10 and the tap root is already touching the bottom.then started growing sideways.will this stunt the growth?

The size of the res, just like a pot, will limit the size of the plant. a 4liter should still give you a decent size plant however