Though it is unlikely, the first one looks like anacharis, but it is probably an elodea species. Common plant, can be bought for like a dollar a bunch anywhere. It grows really fast and can soon dominate an aquarium if it is not quickly trimmed. The second one is beautiful, but I don't know the name. As for cleaning the plants you can probably just put them in quarantine for a month or sound insert ich cure or parasite killer (same thing), however, I know this is no practical solution, sorry 
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