J came home; he was almost as distraught as me about the fish. We did a water change right there and then. J isn’t convinced that the ammonia is a result of lack of water changes… thinks the filter is working all right and all, so it shouldn’t be a problem… we wonder whether the tests might be past their use-by, since we’ve had them forever. Must check that.

Also did a water change on the main tank. Looks better with water to the top.