I am new to planting aquarium. Have a dirt 10 gallon (eco-complete, miracle gro, clay) no fish. Finnex stingray for lighting. In the first week have seen white roots from stem and new leaves...I dose excel every day. The only mistake i did was cleaning the aqua clear 20 hob(a 1 year old seeded one) sponge in the tank which was crystal clear, which made the water cloudy which did not settle even after 24 hours. So did a 90% water change to clean the gravel..and now the repens root turned black and started lossing leaves...any idea what went wrong?