Indoor aquarium to pond - help!

ThomasG

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Hey guys, I'm new here so please cut me some slack if this is impossible. I've been checking on the internet and can't find the answers I need.

My partner was keeping two goldfish in a small tank (unheated), then her brother gave her two more when he moved and could no longer look after them (not fancy goldfish but only 1 is gold, the other 3 are black, and two have many colours on them including reds and blues). The tank is way too small so I've moved them into the biggest container I have for now which is only 20L (I know, still small!). I pick up a 350L aquarium second hand next weekend and finally they'll have a nice home. My plan is to build a pond in the Spring of 2021 (long complicated reason to do with having a shared ownership property which I can purchase the remaining 25% at the end of 2020, but it's too cold to do it then). From what I've read, our 4 goldfish will grow quite a lot in the new tank in 18 months, so my plan is to acclimatize them into the pond once it's built then change the indoor aquarium to a tropical tank.

After spending so much money on the tank and an Eheim 4+600 filter, she wants more fish in our aquarium. I understand the 4 fish we have at current will probably grow quickly, but from what I've seen, there is room for more. As previously mentioned, after I've built the pond, my intention is to put all the cold water fish in there and start heating the tank inside. So are there any fish that I could buy around October-November time that would live in the unheated water inside happily, then go into the pond all year round, other than more goldfish? I've read the goldfish produce a lot of waste and even though I will be doing regular water changes, I would like a bit of variation if possible. The other alternative is any fish that can live in the unheated tank happily and healthily that could also flourish in the heated tank. The tank will currently be kept in a room and the heating is kept at 23C in this room, so I'm assuming the water temperature will be room temperature too?

I guess my ideal situation would be to buy a couple of small koi's and put them into the tank for 18 months then transfer them with the goldfish to the pond. Should I eventually not build the pond or the fish get too big for the tank before I get round to doing the pond, I have two family relatives with ponds and they would happily take them.

I appreciate you all for reading through this but any advice would be greatly appreciated.
 
Hi and welcome to the forum :)

What country do you live in?
How cold does it get in winter?
How warm does it get in summer?
How big is the pond going to be (length x width x height)?
Is the pond going to be shaded or in full sun?
Are you putting a filter on the pond?

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There are a number of coldwater fishes but most don't get big and look boring and drab from above.
Bitterlings, Rosy Barbs, Livebearers, White Cloud Mountain Minnows, Medakas, Paradise fish and Sticklebacks are all capable of living in cold water.

If the pond is going to freeze over in winter, then stay with goldfish.
 
The koi will grow faster than the others. Do you currently have single tailed goldfish. The colored one sounds like a Shubunkin which is a pond fish. I kept 2 comet goldfish in a 29 Gallon tank for about 6 months. One then got too large and I built a pond outside for them. I now have 3 in a garden pond of 150 gallons. Still a little small but they are doing fine. I do water changes of 75% weekly in the pond. Rule of thumb is 100 gallons for the first one and 50 gallons for each additional one. I wouldn’t add any other fish until these get moved to the pond. I have fancy goldfish inside the house. Three are in a 55 gallon and 2 are in a 45 gallon. For fancy goldfish you need 20 gallons for the first and 10 gallons for each additional one. Hope this helps. Best wishes.
 
Hi Colin, firstly thank you for your message and secondly... how did I forget such obvious information! I have answered your questions below.

What country do you live in? South East, UK
How cold does it get in winter? The minimum outside air temperature I would say -2C or -3C at night.
How warm does it get in summer? Maximum air temperature I would say 35C for no longer than a couple of days. We get approx. 30C for couple weeks a year and the rest of our summer is between 20C and 26C.
How big is the pond going to be (length x width x height)? The pond will be a minimum of 2000L (if I buy premade)but I'll try get 3000+L (if I dig a create my own), not decided 100% yet.
Is the pond going to be shaded or in full sun? Sun light in the morning but shade from 1pm (roughly) onwards.
Are you putting a filter on the pond? (Yes there will be an adequate filter on the pond also)
 
Deanasue, I'll try get photos on them tonight to show you as I didn't buy them, I'm not 100% sure what they are.

I understand gallons is easier for you to use, but I think US and UK gallons are different, so do you know how many litres or which unit you are using?

From what I have read, I shouldn't keep fancy goldfish with regular goldfish as the regulars get the food too quick?

That's a lot of water change for a pond. What is the reason for this? I thought the flow of water and an air ball or 2 would give them enough oxygen and the filter would cope with the waste for longer than a week?
 
Deanasue, I'll try get photos on them tonight to show you as I didn't buy them, I'm not 100% sure what they are.

I understand gallons is easier for you to use, but I think US and UK gallons are different, so do you know how many litres or which unit you are using?

From what I have read, I shouldn't keep fancy goldfish with regular goldfish as the regulars get the food too quick?

That's a lot of water change for a pond. What is the reason for this? I thought the flow of water and an air ball or 2 would give them enough oxygen and the filter would cope with the waste for longer than a week?
Correct on fancies vs. single tails. Fancy swim slower and compete for food. I clean weekly because I’m overstocked. When I test the nitrates they are sky high by end of week. I have a filter for a 800 gallon pond do well filtered. If you build a natural pond with dirt bottom and lots of plants then you won’t have to clean it. Mine is under a patio cover so unfortunately plants won’t grow. I’ll see if I can find a pic of the pond I bought.
 
AC596344-0A73-4C68-A06C-3906C1D18256.png
This is like mine only this is the 125 gallon one.
 
2000l is not that big for a pond. I regard my pond (In SE England) fully stocked. At 7000litres I have 13 fish:
4 Golden Orfe
5 ghost carp / koi - these are hardier than koi and marginally less messy
4 common goldfish

FWIW the smallest fish in there are about 18" long - the biggest ghost is around 30"
 
Whew! Yes, my largest common is only about 12”. I only have a common, a comet, and a Shubunkin in mine. They did have a mess of fry this year which I sold to a rancher. Got lucky!
 
I've just checked out the pond I'm looking at, its an 8ft octagonal pond, 1m high. My calculations were wrong. It would be about 4000L. Going off your stocking, I should still be able to keep my 4 goldfish/shubumkins and 5 ghost/koi carp in there? Do you have any photos on you 7000L pond? Must be nice!

However, referring back to the original question. Which kind of fish would be happy living in the 350L aquarium for 18 months before moving to the pond and how many?
 
Over 1,000 gallons in a prefab pound? Wow! May I ask where you found it?
 
It isn't prefab, it's a wooden exterior with a liner inside.
 

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