First pic looks like it maybe a Frill Plant but not 100% sure. Second pic is Lucky Bamboo and will not do well fully submersed. Only the roots should be in the water. Third pic is a Java Fern and the Rhizome should not be under the gravel it will rot. You should attach it to a rock or some driftwood. If not then just cover roots with gravel and not the Rhizome.
If infact that is a Frill plant it may not do too hot after a while. They seem to like more intense light, so if you just have the standard strip that came with the tank it may not be enough but only time will tell.