General Rule

[devil238]

how many gallons UK of water would you need for four minnows one shubunkin (4inch) and a comet (3inch)?

 

[black angel]

The more water you can provide then the better plus lots of filtration and more biological the better.
Depends on if you are talking one tank for the rest of their lives or if you are prepared to upgrade as you go.
For me I would say 50 gallons minimum for those two fish and the minnows for life, but the minnows are in danger of being eaten the bigger the goldies grow.
The comet has a potential to grow to around 18 inches and the shub to around a foot.

 

[devil238]

'' i think i should get a seperate tank for my minnows because ive always feared my fish might go nuts and eat the littler fish. my tank at the moment is tiny compared to 50 gall. My mum (I live with my parents btw im only 14) say that we havent got a big enough space indoors for fish tank that size and think that if i cant lift my tank when its full now (i so totally can!) i couldnt lift a 50 gall if it only had a little water in it. im so annoyed and i dont want my fish to die from overcrowding.

but my gold fish seem ok. they dint fight for space. they remain active and eat well.