I know its a few days since original posting, but I haven't been on AB for a few days. I had a similar problem when our daughter left home , I was left looking after her tropical fish. I advertised them as free to knowledgeable home. With no luck. Then I remembered that our local school had a large tropical tank in there reception, contacted them and to my delight took them off my hands. If you haven't already re-homed them, try schools, doctor's surgeries etc.