The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
We'd need way more info about your system to tell you if you need to dose.
Corals both type and amount, params, daily consumption of elements, lighting, etc.
Wc's are also for more than just nutrient removal, they also help replenish countless elements required in reefs.
Dose with a product called fuel it works wonders I've been using it for four years and had only positives. My GSP was only a quarter inch and in a year it's turned into this and I've spilt the colony up multiple times. Before using FUEL it did not grow as fast at all. My corals love the stuff