I would have to say a dwc hydroponic set up is the way forward.. I used a 5 litre food container, cut a net pot sized hole for which yhe net pot will sit flush in, i drill 3 holes in the lid to to relieve pressure build up and 1 for an aquarium airline and small diffuser i ran the airline cable to the pump which sits above the container with a non return valve to stop watter backtracking in to the pump, i then filled the container with 4.5 litres of tap water, adjusted the ph to 5.5 (yellow) - with a ph test kit, you use phosphorus 81% acid to lower the ph, (a few drops should do it!! Then in the net pot put enough clay hydro balls in so a rockwool cube will sit level,-flush, with the container lid then pour more clay balls around the cube to support it, .. Be sure to wash the clay balls 1st cos most the time they are very dusty with grit etc... Put the set up in a warm dark place for a week or 2, once a shoot has sprouted introduce light at a 18/on 6/off for vegging, you can put it into flower any time after 11 inches give it 2 days of darkness then swap light from blue to red spec, and use on a 12/on 12/off cycle, you can buy nuits on line or from your hydroponics store, nuits feed and build up the health/power of your plant they need them to become mature ... I sujest canna nuits, if you go to canna s web site
www.canna.com they will tell you more and you can even do a custom grow guide on the site custom to the size of your tank!!! Hydro produces larger plants in a quicker time, earth is messy slow and old fashioned... Go with hydro its a learing curb... I am glad i learnt it.. I ve never looked back !!!!!!!!!!!!!!!!!!! Hope this helps from stelthy
PS BE SURE TO ADD THE SEED TO THE ROCK WOOL, ABOUT 1CM IN
AND CHANGE THE WATER EVERY TIME THE LEVEL DROPS 3 INCHES FROM THE LID