They appear to be another variation of Scott's Miracle Grow Plus in a gel cap which can be found for sale on many of the planted aquarium forums. My limited experience of trying Scotts Miracle Grow Plus with aquatic plants resulted in an explosion of algae.
They appear to be another variation of Scott's Miracle Grow Plus in a gel cap which can be found for sale on many of the planted aquarium forums. My limited experience of trying Scotts Miracle Grow Plus with aquatic plants resulted in an explosion of algae.
I can't find "Scotts Miracle Gro Plus". Do you mean Scotts Osmocote Plus (which is popular) ?
I've used the root tabs and they have worked well, the problem with the gel caps is that they dissolve and what you have left is small pellets that seemed to make it to the surface of the soil. You need to bury them really deep in the substrate, I switched to Seachem root ferts and they have worked better for me.
Bob's Tropical Plants Root Tabs? 
Linear Mode
