No. All crops need the similar elements in different ratios. Having good control over the quantities and ratio is important, but for medical cannabis, six to eight dosing channels will suffice. You’ll need three for N-P-K, one for calcium and magnesium, one for micro elements, and the last for acid to control pH. An 18-channel dosing system isn’t “the more, the merrier.” Too many dosing channels is a drain on your resources in terms of both time and finances, to accomplish something you could do more simply.