I bought two amazon swords for my 6g betta tank. It has sand as the substrate, and was decorated with plastic stuff before. However, my betta loves the real plants so much more! They are melting a bit, brownish spots on the leaves, and are turning yellow. I have an 8000k lamp 14w(all i could find to fit my t

, root tabs and some Aqueon water column plant food. I'm hoping they don't die on me! Any tips? I dont have co2.