vivweaver... floaters really love nitrates... you can probably get some growth by adding potassium nitrate... for good measure maybe add kh2po4 and plantex csm+b... if your water is soft, especially gh, you can add barr's gh booster and/or epsom salts (edible kind [calcium carbonate or caco3])... of course this assumes your lighting is adequate... the bad part is overdoing it can lead to deaths easily, so be very careful and use your test kit faithfully if you choose to go this route... i find the scoop/spoon in the red sea master test kit is just under 1/32 tsp, so it helps me bigtime for dosing!... you might also want a decent set of measuring spoons that include 1/8 tsp... here are a couple links to sites where you can get real ferts for a fish tank and one that explains tom barrs' estimative index for dummies (like me) lol...
Fertilizers For The Planted Tank | Ferts
Planted Aquarium Fertilizer - Main, Main, Dry Fertilizers, Dry Fertilizers,
Estimative Index Dosing Guide - Fertilizing - Aquatic Plant Central
also instructions for root tabs if you have any rooted aquatic plants:
DIY - Root Tabs - Aquaria Central
" - mrcarabao 2009
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