Fertilizer Needed??

Tank size? Lighting? Usually adding CO2 does increase the need for fertilizers.

Edit: in the link those are fertilizer sticks for heavy root feeding plants. Riccia and mosses get their nutrients from the water, so liquid fertilizers may be needed.

http://www.aquariacentral.com/forums/showthread.php?t=36218

That thread has a brief description on which plants need deeper substrates. The more heavy root feeders need gravel fertilizers like those in your link.
 
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