So, in the course of examining Galahad's tail (which did eventually determine is a true double tail, they're both just so full you can only see them separate when he does certain kinds of turns -- his body appears to be normal length), I realised he has 3(!) pelvic fins. He generally keeps 2 on one side, and 1 on the other. Has anyone else seen a fish like this? Does this have any impact on his care?
I did notice a touch of shredding to his lower caudal fin this AM, so a frantically did a 100% water change, added equivalent of 1 tsp aq. salt, and some extra stress coat, and went over his silk plants carefully and found a bit of dried glue that might have been the culprit and trimmed it off). He's still not eating, but I am thinking that because he's new (Odysseus has always eaten like a pig from day 1, but I understand that is not typical).
Do doubletails have different needs from other bettas? I can't find much about this, except that they can be weighed down by their fins (nobody told Galahad obviously, he's active as can be), and that if their body is shorter they can be prone to swim bladder issues.