Beautiful discus! Such a lovely shade of blue. Sorry to hear that you lost two. It's very, very tricky to do rescapes while fish are in the tank. I've done them in the past keeping the discus in the tank, but siphoning out stirred up mulm constantly and replacing with plenty of fresh water before pulling another plant up. And of course I held my breath because I know to be truly safe, you must take the fish out of the tank while rescaping. The tank looks very nice. Hopefully you'll be able to add a couple new discus soon.