Sorry for your loss bro. What I've from experience is that if you house your payara with silver dollars (a lot of them) or any other fast moving fish, they tend to become less skittish over time. I have 8 scombies in a 240 and I had'em by themselves at first. And every time they sensed vibration in the water (say tapping the glass or closing the door hard) they would freak out, in fact, one of my scombies has a blind eye cause he ran into the drift wood FAST when I tapped on the glass! Then I decided to add about 12 silver dollars in there with them (amongst some other fish). It has been about 2 months and they have become extremely relaxed now. In fact, I can tap the acrylic all I want and them don't seem to get bothered by it one bit.