Root tabs ingredients, all safe for coral?

[CHSUB]

Need to get nutrition to my mangrove without adding to reef tank. Seachem root tabs for freshwater an option?

Amounts per 1 g
Total Nitrogen (N)	0.4%
0.4 % Water Soluble Nitrogen
Soluble Potash (K2O)	0.15%
Calcium (Ca)	.15%
Magnesium (Mg)	0.1%
0.01% Water Soluble Magnesium
Sulfur (S)	15%
Iron (Fe)	2%
2% Water Soluble Iron (Fe)
Manganese (Mn)	0.1%
0.01% Water Soluble Manganese (Mn)

Derived from: Potassium Chloride, Calcium Sulfate, Magnesium Chloride, Ferrous Gluconate, Magnesium Sulfate, Manganese Sulfate, Hydrolyzed Yeast.

 

[TX_REEF]

I don't see anything there that would be harmful to corals unless in extreme excess.

 

[Randy Holmes-Farley]

Is there a reason to think they are not already getting what they need?

 

[CHSUB]

Is there a reason to think they are not already getting what they need?

Tank’s no3 and po4 are undetectable with Salifert kits, however have good coral growth and some algae. I did scope all tang poop up and stuff into gravel at roots. Mangrove has no noticeable growth in 3 months, thinking something is missing. Have plenty of light, 65 watt 8.5 hours dedicated to mangrove. Grows slower than I thought or is missing something?

 

[CHSUB]

Update: I did notice some yellowing/ browning on my growth shoot and a little yellowing of old leaves which is very concerning to me as I really want this to be a mangrove tank. So I used a single Seachem root tab inserted in the grave around the mangrove. 2 days later po4 is now reading .02, could be unrelated? No other changes. I did order a icp test to further understand my water chemistry. Tank is really looking good, nuisance algae is nearly gone and coralline is popping up everywhere, 5 months in fingers crossed.