A couple of years ago, my children kept tropical fishes, i got the regurlar stuff for their aquariums. among those aquatic plants, after the fishes went down the toilet. I tried to keep the plants alive, they did well for a couple of years but then they died. I want to have aquatic plants again, I want suggestions in which one is better for inside the house, and which one is going to be strong enough to survive winter here in Pennsylvania. Thanks. for your time. GB.