Just watch that that common doesn't pick at the fantails. I've heard the single tailed goldfish can do a number on fantails because if they start picking the fantail is too slow to escape. Normally I don't worry about it in the young'uns like that but I see the common is much larger than the others so just keep an eye out.
I've spotted many a fantail mixed with other goldies that was missing a half of his fan.
Then again, my aunt has a large goldfish tank with mature fish and she's got all white fantails and several comets, probably a dozen fish, and she has no problems so what do I know, lol.
*edit
Btw, do love the setup. Reminds me how badly I want to put one in my kitchen. Stupids husband has a "no building lakes indoors" attitude..
Then again, my aunt has a large goldfish tank with mature fish and she's got all white fantails and several comets, probably a dozen fish, and she has no problems so what do I know, lol.
*edit
Btw, do love the setup. Reminds me how badly I want to put one in my kitchen. Stupids husband has a "no building lakes indoors" attitude..

Wait until you get into polys, dats, aros, rays, pbass etc