This is a bit off topic, but since you are avoid buying more, you'll definately what to avoid killing them. I've had three. And they all died off, one by one, each time I let my CO2 creep up to around 40 ppm.
IMO it's no coincidence, and probably something you might want to watch.
Steve - 33g reef and a 180g planted in need of a re-scape.