I'm going to be adding some Riccia, Java Moss, and Christmas Moss soon. I will also be adding DIY CO2. I was wondering is I will need additional fertilizers like this http://www.floridadriftwood.com/product.asp?3=52 or anything else. Thanks.
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.
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.