all goldfish will get too big. You know the inch per gallon rule? well, even if you take that inot account (and goldies are much much messier than other fish), fancy goldies grow to about 8" - 10" each, and they need all that room.
I would not recommend goldies for your setup, not only because they grow very fast. You would need a lot more filtration than an underground filter to keep a tank with three goldies clean!
The stocking rule for goldfish is:
10 gallons per fish for baby goldfish (yep, even the 1 inch fish)
15 gallons per adult fish for fancy deep-bodied types
20 - 25 gallons per fish for the slim, fast-swimming types.
goldfish also grow very fast. they will be munching up your whitedlowds in no time. They should really not be kept with anything other than goldfish.
The reason most fancy goldies are not suitable to live in ponds is because they are slow-swimmers and are more likely to get eaten up by a heron or some other predator. Also, they are not as hardy as most "pond" goldfish and may be more sensitive to temperature swings and such in a pond.
As for your tank... you could put... 3 goldies into your fishtank if you are going to upgrade them later (no other fish)
OR
just 2 fancy goldies and they can live in the tank all their life (10 to 20 years when well looked after)
OR
2 goldies, 9 white clowds and the shrimp (goldies will need to be upgraded as they grow and munch on the minnows in a couple of months)
OR
you oculd have a much easyer cold water setup with NO GOLDFISH. You could get something else cold water. There are other fish you could put in an unheated tank. the rosy barbs and the golden barbs are pretty and colourful fish, and do fine in temperatures of around 18*C (I'm sure your house probably doesn't get much colder than that).
http://www.thetropicaltank.co.uk/Fishindx/rosybarb.htm
http://www.thetropicaltank.co.uk/Fishindx/goldbarb.htm
you could also get cold water guppies or danios.
I would not recommend goldies for your setup, not only because they grow very fast. You would need a lot more filtration than an underground filter to keep a tank with three goldies clean!
The stocking rule for goldfish is:
10 gallons per fish for baby goldfish (yep, even the 1 inch fish)
15 gallons per adult fish for fancy deep-bodied types
20 - 25 gallons per fish for the slim, fast-swimming types.
goldfish also grow very fast. they will be munching up your whitedlowds in no time. They should really not be kept with anything other than goldfish.
The reason most fancy goldies are not suitable to live in ponds is because they are slow-swimmers and are more likely to get eaten up by a heron or some other predator. Also, they are not as hardy as most "pond" goldfish and may be more sensitive to temperature swings and such in a pond.
As for your tank... you could put... 3 goldies into your fishtank if you are going to upgrade them later (no other fish)
OR
just 2 fancy goldies and they can live in the tank all their life (10 to 20 years when well looked after)
OR
2 goldies, 9 white clowds and the shrimp (goldies will need to be upgraded as they grow and munch on the minnows in a couple of months)
OR
you oculd have a much easyer cold water setup with NO GOLDFISH. You could get something else cold water. There are other fish you could put in an unheated tank. the rosy barbs and the golden barbs are pretty and colourful fish, and do fine in temperatures of around 18*C (I'm sure your house probably doesn't get much colder than that).
http://www.thetropicaltank.co.uk/Fishindx/rosybarb.htm
http://www.thetropicaltank.co.uk/Fishindx/goldbarb.htm
you could also get cold water guppies or danios.