My sister recently got into fishkeeping. While I'm happy for her, she got a ten gallon tank and is insisting upon putting three goldfish into it. Now, with my own goldfish in a ten gallon experience (with only two!) I tell her about the bioload and stress of having one, let alone three goldfish into a ten gallon tank. But she's vehement in putting three goldies into that itty bitty tank- what can I say to convince her not to? She insists she'll do 10% water changes every day and watch the parameters like a hawk, but I when I tell her that's not enough, she doesn't believe me. Any tips?