DD has a tank with a filter and her pride and joy fish friend that she won last year in a fairground.
We've bough it a little companion from my local aquarium and very expensive over-priced brand garden centre TWICE and each fish has only lasted about 6 weeks.
We've carefully added the drops to the tank and she feeds them a tiny pinch carefully each morning and night.
What are we doing wrong? She's distraught every time one dies but now wants a third so that Lucky the Fair ground fish isn't lonely.