Dead rainbow. Just discovered floating at the top of the tank. Had been no signs in any of them yesterday, and I hadn’t seen it earlier in the morning either. All the others seems to be carrying on quite happily… sigh.

Ajax is asleep on a piece of wood; looks like that, anyway. And J pointed out to me this spot on his side where you can see what looks like a valve working; possibly breathing?

Just a bit later
I think there are only five rainbows. We moved the light soon after I wrote the above so that we could have a closer look at Ajax sitting on the back wall, and there was a rainbow body, on the glass above the water. It didn’t look like it had been there for very long… I guess we might have smelled it, had it been there a while. So that’s a bit depressing.