The only true complaint I’ve heard over using Miracle Gro (other than dosing debates) are the concerns about phosphates. It appears this fert is not well known in the hobby.
That's the only concern???
Well, I'll help by adding some other concerns, and cannot see why one would pick this unless you are treating a massive salt pond. Food grade sodium nitrate is not expensive and carries a high assurance of purity.
Some concerns:
1. Do you need potassium? You will be adding it whether you need it or not.
2. It claims it is " High in nitrogen and iron to promote deep green grass. " How much iron? A huge amount. The label says it is about 1% of the nitrogen content, or about 0.2% of the nitrate added. So if you add 2 ppm nitrate equivalent per day, you are adding about 0.004 ppm (4 ppb) iron per day. That may be excessive, but might be OK. i dosed about 30 times less when I used iron.
3. It has no need to be pure from other metals like copper that may be fine for a lawn (the EPA allows a lot of copper in drinking water that folks also water lawns with) but which might be problematic in a reef aquarium.
4. The label says it contains 3% sulfur. In what form?
5. The nitrogen form is ammonia and urea (as noted above). You are not dosing nitrate. Is that good or bad? Not sure, but you sure do not want to dose significant amounts of ammonia all at once.
