So, just added some Argentinian Swords, Amazon Swords and some Anubis to my tank with Java Fern. I knew I needed more substrate because my plants roots where sometimes sticking out and they were floating to the surface. So I got one of those small bags of gravel substrate and rinsed it and added it to my tank. Is that ok? Also, has anyone ever had a planted tank grow without plant food? And has anyone ever had Argentinian Swords?