replanting

My Banana Plant is getting big! I don't know if this is normal lol. It's leaves turn reddish but the ones they have in the store where I got them stay small and green. I read somewhere you can cut the leaves off and make new plants. Anyone tried this?

Do I need to tie down the roots of the two Anubias that I recently attached to rocks down so they can root themselves to the rocks or will they eventually find and attach themselves to the rocks? They are floating above the rock about 1-2mm off the rocks. Yours, Trent