Perhaps in a very small tank it is. The nice thing about reef tanks is that the salt mixture has just about everything you need, it's as if our water conditioners had all the fertilizers needed for plant growth! All I add occasionally is Kalkwasser for now, I'm sure once the corals get big they will consume more and I may need to add a couple more elements here and there but it's nothing compared to what we have to do to keep our planted tanks running at full speed. Things are certainly more delicate however so more care needs to be taken to maintain a stable temperature, salinity and so on. In general good things happen slowly and bad things happen overnight :wink:
Besides that, you will be surprised just how easy it is. A lot of light, lot's of water movement, plenty of rock for filtration and a skimmer. That's the important equipment IMO. I have a fuge but since running the skimmer 24/7 the macro algae is struggling so it's being converted to a smaller fuge with built-in frag grow-out tank.