Hey man,
Your tank, from what can be seen in the video, looks like an awesome set up. We have very similar set ups except yours is bigger and better.
I have 4 altifrons (my son told me the other day he saw baby eartheaters but I haven't), wild and domestic discus, wild angels, and a few others. Yea, that calvus looks completely out of place.
You need to post a full tank shot. Love to see the entire set up. By the way, where are you located?