Plants..

I have a Sword plant that it keeps releasing from the gravel and floting cuz my pacu swims to hard and makes it float, if i tie the plant with a small fishing weight, will that harm my water??? will it get rusty??

Get a small tera cotta pot from home depot, soak it for a few days in water to get it good and clean. Fill it with washed sand and plant it in there and then add a layer of gravel on top, it should stay.