Your pond is overstocked quite severely and your goldfish will be stumped. Comets need 30 gallons for one fish then 15-20 gallons for every additional fish. They are meant to grow 10-14" whilst I should think yours will top off at 6"Hi all, this will be my first official post . I started this container pond about a year ago. It has been great fun, and i have had somewhat better luck with plants outdoors than i have had indoors. The pond is stocked with 3 pond comets and 2 australian rainbows. There is no filter but lots of hornwort instead:icon_lol:. there is also a dwarf water lily which should flower in a couple of weeks now. I also have a couple of bog plants on the side shelves.