The 2nd one is Hornwort
The 3rd appears to be a melon sword. I know it's a sword plant, but I *think* its a melon sword
4th is mondo grass, mondo grass isn't fully aquatic and it'll rot underwater. If you have sunlight in that room, you COULD plant it into the top of your filter and let it grow that way.
I'm looking up the 1st one. I really like it's deep purples. Bear in mind, it may not keep it's purple, red and purple plants require high lighting to keep the color, it'll just turn green.
ETA: make sure the metal bendy thingys are off the plants, in my experience, they rot the pieces they hold together. Your and and soil should keep a good enough hold on it ;)