Osmocote plus gelcaps are pretty good. So are Rootmedic root caps. Seachem root tabs are not bad, I think. They all are applied in a similar fashion. You take them and bury them deep in the substrate. They last anywhere from 3-6 months, so you should plan on replacing them roughly that often. 25 root tabs should just about cover a 55G tank. You can put slightly more than that if you'd like to get more coverage, especially around your heavy root feeders (for example crypts and swords).
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