Okay so im in a tiz

I went to the fair yesterday
and after one-eyed-jack (R.I.P) bless him went to the sea above
i wanted to get another goldfish as my other two were actually distressed about his death bless them.

Anyway i was at the fair and thought i wonder if ther are any gold fish.
There was
I won 2 'goldfish'

One of them (oblivion) is a bristol shubkin
Were as doris well she is not, my first thoughts were oh she is just a young fish, looked in one of my fish books, none of them had her shape

SHE looks JUST like a sprat fish same colour same shape.

Just wanted to no WTF ! why do i have a sprat fish in my tank are goldfish and sprat fish compatible will they get one, like will the goldsish eat all the food leaving none for dorris?

Is she okay in the tank, as i have become attached to her, should i go back to the fair and get one of her own kind ?

I have a 4ft by 2 ft tank so room isnt an issue (Y)
there isnt much on sprat fish care, as most people eat them
so help please

many thanks
xx

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My Zoo!
Hamters - Millie & Princess.Gerbil-Drexel Mice-Salazar, Chocolate-drop, Snowflake, Monty, The Twins. Rat-Walter Goldfish-Orange Horses- Sinbad, Pinkie & Jasper Dogs- Freddie, Charlie, Suzie & Tacco 60+ CockRoaches, 13 Giant african land snails and 22 Stick insects! R.I.P TO ALL MY BABIES OVER RAINBOW BRIDGE <3

I seriously doubt that you've been given a Sprat (Sprattus sprattus balticus) as this is a marine species and wouldn't survive in freshwater conditions required by goldfish. Chances are that it's a young goldfish, which are naturally a silver or brown colour for the first few months of life, before they lose this colour and develop the gold or canary-yellow pigmentation.

how big will he grow ?

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My Zoo!
Hamters - Millie & Princess.Gerbil-Drexel Mice-Salazar, Chocolate-drop, Snowflake, Monty, The Twins. Rat-Walter Goldfish-Orange Horses- Sinbad, Pinkie & Jasper Dogs- Freddie, Charlie, Suzie & Tacco 60+ CockRoaches, 13 Giant african land snails and 22 Stick insects! R.I.P TO ALL MY BABIES OVER RAINBOW BRIDGE <3

Common goldfish can top 30cm/12" so you'd be looking along the lines of a 6 x 2 x 2ft tank once they're fully grown. If the fish turns out to be an Orfe (equally as likely) then you'd be looking at around 46-60cm/18-24".