My mangroves looks like they have nutrient deficiency.
I heard that you can use root tab, but can someone tell me if this looks safe for a coral reef tank.
It's containing copper... but in trace amounts.
I wouldn't add it. I just feed my fish well and do regular weekly water changes to keep my mangroves thriving.
If you were to add something I'd use chaetogro or individual elements you think are lacking.
I watched a video where someone said they did that with some success, however, when discussing with my local fish store, they advised against it saying some of the components may be harmful to corals/other saltwater life. . .
Inappropriate Reefer on YouTube once said he puts some sort of tab in the sand. He keeps some softies in there and they seem fine. But I would be warry without someone doing some tests.