no dont add lime no need

a soilless mix wants a ph of around 6

coco is the simpliest way to grow if you use canna coco nutes u cannot get i wrong
i only got a ec/ ph meter last week when i check everything was exactly as it said in the canna grow chart

but with the clone food ad alittle ph down as 2ml nutes+root juice = 7.5 ph 1.3ec

4ml nutes+1.75ml cannazym = 6.1ph 2.1ec