TNC plugs are good as are TPN+ caps...however, plants don't really need root tabs, you will read that these plants are 'heavy root feeders', well theres nothing really classed as heavy root feeders, these plants will do well if the water column is dosed well. These 'heavy root feeders' are often found in area that flood and the root systems are actually there to anchor the plant rather than feed the plant. Thats not to say the root will take nutrients as it will, but just remember that there's nothing as such as a heavy root feeder.