I'm afraid you have got two species of terrestrial plants there. They will die if kept permanently underwater.
The first one is a palm, probably Chamaedorea sp. (possibly C.cataractarum) and the second is an Ophiopogon sp..
If they were sold as aquatic plants then you should ask for your money back or for proper aquatics to replce them as they will just rot underwater. They will grow well if their roots are kept wet as house plants in a humid, bright room or greenhouse though.