Ok, thanks for the info RR & Star. I've already discovered that they don't play nice with other fish. They're currently in a tank with a convict pair, and the male is constantly flaring at them. Also, he constantly chases the female so that she now hides behind the filter. Thankfully, my divider should be arriving by the weekend so she'll be able to spend the rest of her quarantine time in peace.
Are there any suitable tank mates at all for a single texas?