I wouldnt put to much in at the one time...mostly all coldwater fish will live happily ....but i dont really recomend Koi they need a pond and a large tank..

Other Coldwater Fish

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R.I.P ...Mesha xx Never Forget you xx
I will be back! i need to fight the BIG "C" atm!

i wouldn't dream of putting too many in just don't know what type to get or how many.
Like i said i'll be looking after them and they are for a 2 year old to watch. I've been told gold fish produce alot of waste as to speak so was thinking if there is owt else, any ideas are welcome as we not looikng at getting the fish till at least next weeken so the tank has settled in fully

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if you dont want a heater but its in a fairly warm house, you could have a few what are called temperate fish including Danio's(there are a few types of these), White Cloud Minnows, Cherry Barbs, Gold Barbs. I wouldn't suggest mixing these with normal coldwater fish but a mix of any of these together will be fine, with these i would suggest about 6 to start and another 6 when the tank has matured a month or so later. they move about alot more and they are cleaner and more colourful so maybe a better idea? downside is they are not quite as hardy as normal goldfish, they dont like kids banging on tanks in particular(no fish do), so you would have to be careful.
Its pretty much a option of 1 of any coldwater fantail or goldfish or 6 of the smaller temperate fish. A good fish place will be able to tell you what is a temperate fish.
Then add the same again in a month or so.

*Heidi*

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Oh dear I don't want to be the bearer of bad news doobles, but a 17 litre tank isn't really big enough for any fish at all. Tanks that small should not be sold in my opinion.

If its goldfish you're after, the fancy varieties need around 40 litres per fish and the common varieties closer to 80 litres per fish - which I know sounds alot, but bear in mind that a fancy can grow to 6 inches in length and a common goldfish up to 12 inches.
You were correctly informed that they are very messy fish, which is another reason they need such large tanks. They produce alot of waste, and in a 17 litre tank the water would quickly become toxic.

White cloud mountain minnows have been mentioned, and I think you could happily home a small shoal of 6 in about a 30 litre tank. Though I would mention that they're not usually recommended as good tankmates for goldfish, as once the goldfish get bigger they may well eat the minnows!

Also, you mentioned that you're leaving the tank to 'settle' - have you been cycling it? Info on cycling - Frequently asked questions on fishless cycling | Practical Fishkeeping magazine

Again, I'm sorry its not what you wanted to hear, but you sound like you really want to do the best for any fish you get, and it really wouldn't be right to put goldfish in a tank that size.

Took the words right out of my mouth! The tank is too small for goldfish I'm afraid, the only fish I would generally recommend would be Microrasboras or a pair of Killifish, however these both need tropical conditions.