What tank are we talking about?
If you have 20 watts over the 38g, then thats your issue. Fertilizers won't help the plants survive. If its the 20g, then fertilizers could possibly help, but the lighting is still low and could be the issue if you aren't choosing low light plants.
20 watts over the 20g is fine for Anubias, Crypts, and Java fern, but Swords need more light. 20 watts over the 38g and you'll be lucky to grow Java fern.
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Originally Posted by Blue Cray
If you have good lighting suppliments arent usually neccessary.
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Not true. All plants need nutrients. The more lighting you have, the more you need to supplement nutrients because they use them up faster.