90% of plant problems are due to lack of good CO2 consistent with the light level being used, which is usually too high. (OK, maybe it is 60%, but it is still the major cause of plant growth problems.) Fertilizing can be done almost without thought, by just following an EI method, so you know you always have enough of all of the nutrients. But, getting the CO2 right can be a big puzzle for many people, and the percent that understand that you don't need very high light intensity, normally used with reef tanks, to grow plants isn't nearly as big as it should be. Always look at those two factors first and get them "right", before worrying about specific nutrients.