Just wondering how difficult it’ll be for me to go from bare bottom to sand in my fluval evo 13.5 I have a clown and six line for fish. For coral I have a hammer frog spawn carpet mushroom Kenya tree couple of candy canes riccordea Duncan coral. Do I drain water completely place my rocks where my coral are into the drained water in like a bucket and place sand in tank then put rocks back in place and fill up with half old water half new?? Thanks for any tips you give me