You may ultimately have to decide between keeping just the RD or just the chocolate, or else the RD may decide for you.....with a bad outcome for the chocolate. But, who knows, they may co-habitat fine for life.
I predict a drastic change in your tank over time with influence from the posts on this . Mine changed a lot over time but in a good way. Nice rd I like them a lot but the center piece is massive in your fifty five similar to what I started with but eventually removed it and made more space for a more sustainable tank.