Snowball (the cat of the icon) has discovered the triops. I gave the triops some carrot again and he went crazy... so I get the impression he likes that. His charging around the got Snowball's attaention, and she's been eagerly watching him, and of course trying to work out how to get him out of that silly little tank. I've taken the precaution of blocking the tank so that she can't push it over. Now that I'm happy it's secure she can watch him all she likes from her favourite perch on the windowsill.