I currently have 5 bunches of Vallisneria in my tank along with another plant I dont know the name of (pic below) and I have just order some Sagittaria subulata from ebay (25 bunches, dont think i'll need it all to be honest!)

Now my question is will any of these plants do better with root tabs? At the moment I dose once a week with a liquid fertilizer (JBL Ferropol), I have only been using it for less than a week so I dont know how effective it will be in the long run. I dont use any co2.

Here is the plant I need an I.D on (the middle one):