Planted Echinodorus macrophyllus as a solitary background plant. Temp: 28C pH: 6.8 Fe: 0.2ppm Hardness: 4dKH Lighting period: 10 hours (metal halide) Problem: The plant looks healthy but the leaves did not appear to be in its normal egg-shaped. The leaves looks similar to those of a Sword plant, but bigger. Please advise. rgds.