Hello All, i have had artificial plants in my aquariums for years, however i am finding that some of my fish dont particularly enjoy having the plastic plants rub up against them, so i am looking at potentially putting in real plants as the majority of my fish prefer heavily planted aquariums. so my question is this: will i need to change my substrate? also; Which plants tend to be the lowest maintenance possible (trimming and whatnot)? Can i put plants into an aquarium that already has fish? other than stress will there be any effect on my fish well being?