03-14-2012, 01:55 PM
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Originally Posted by thekoimaiden
It's great that your comets are going to a pond, but unfortunately your tank is too small for another goldfish. The one fantail you have in there is pushing it as goldfish can grow anywhere from 15 cm to 30 cm long (depending on genetics and diet).
Your filtration is also not sufficient. Goldfish need double filtration (a 20 gal tank need a filter rated for a 40 gal), and undergravel filters have a habit of trapping a lot of waste if not properly cleaned. This can cause major problems in a goldfish tank as they are major poopers. I would remove it and add live plants like hornwort and anarcharis/elodea.
Alternatively you could put the fantail in the pond with the commons. As long as they don't bully the fantail it would be a much better setup. Fantails are hardy enough to survive in ponds. Depending on how cold it gets in the winter, you might need to bring it in for the winter.
btw maiden I never told you how nice of a pond you have! I'm jealous!