Hello, I recently set up a 40 G breeder to try out a planted tank. The tank is fully cycled just the plants are new. I planted the plants over 3 inches of lava rock/soil mix, and let the plants settle for 1 week before adding fish (a few 2'' Amazon puffer) back. I have the light scheduled with 8 hours on time. it has been about 3 weeks, but the leaves are rotting and plants even drying, can someone help with anything I may have done wrong? too much light? too little light?