Well, so far so good... moved the parents out after the last update as they'd stopped spawning for the time being. Counted 5 or 6 fry after that, of which at least 4 are still alive (hard to spot!). One isn't looking terribly well but the other 3 are getting fat on tank microfauna. Still too small for microworms.
If these guys make it to a size where they'll take microworms then I'll move them to a breeding net and get the adults spawning again.
20 degrees, pH 8.4, 170ppm for the record.
(video's going to take an hour before its available)