If I want to add plants to an established tank, but I don't want to tear tank down, can I just put plants in with the gravel I have? My gravel is the smaller stuff ( about 1/16th - 1/8th inch ) and it is about 1 1/2 inch thick in the front and slopes to about 3 inches or so in back. An aquarium store I trust told me the plants should do fine in just the gravel I have. I have 4 watts per gallon of light. Any advice on getting going would be nice, such as fertalizer, ect. Thanks!