The fastest and surest way is to do water changes. Not all fertilizers will be taken out of the water. Plants will just grow badly, stop growing and die if they are missing one essential fertilizer ( a macro nutrient for example, like P), event though there may be plenty of another nutrient in the water column ( like Fe). In other words plants do best when they have enough of everything, no need to worry about balancing 15 or so nutrients on an precise scale. Could one realistically even do that ?
On hiatus till later this year