Hi, I've recently purchased a small 10 gallon Biorb and have been advised to only add one goldfish or 4 small shoaling fish a month to it. I have a small red-cap oranda fan-tail who's doing very well and am wondering what to add next. I've read that the fan-tails do well at near-tropical temperatures 20-24C (68-76F) so was thinking maybe some tetras or danios. Anyone have any suggestions cos I'm very new to this. Thanks .

P.S. Don't worry I'm not going to overstock - I know 10 gallons isn't a lot. Maybe one more goldfish and some shoalers.