Hi Sajacobs, I'd be interested to know what make the pond is?

Over here we have Blagdon Affinity Ponds, but all are too small for goldfish.
Currently I'm contemplating having a large tank indoors on the floor and treating it like a pond, a tank that holds 700- 800 litres or so could be classed as a mini pond? I hope?

As for second hand tanks, I've not looked into it hugely myself, but generally I would say, if you see a tank you like, go out and see it in person -take someone you know with you-, check the tank over yourself, that way you'll see cracks or find scratches. Don't take the money with you to the house either, if you decide once you've seen the tank, that you want to take it, then take the seller to a bank and do the transaction there

I know Gumtree has some great advice on buying online, I think it's where I got most of the above from!
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Nice tank,Sounds like a bargain, remember to cost up all the ancillary equipment though E.G. you are going to need to upgrade the filtration, hood, light system, gravel, plants, background, bogwood, ornaments.

Multi-Tank Sydrome join the club!

I am currently using that mantra. I have big plans for the future and my fish are fully included. A big pond and lots of tanks everywhere. Welcome to the fishy club Sajacobs.

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Fancy Goldfish:
30 gallons (36 US gallons, 140 litres) for the first fish with an extra 10 gallons (12 US gallons, 45 litres) for each extra fish. The tank needs to have a minimum length of 3 feet to allow swimming room.

 for two Fancies:50 US gallons to be on the safe side....you could easily add a couple of bristlenoses and half-a-dozen snails without over-stocking..

.something like  a RIO180(for 2 fancies) or a Fluval Roma 200(could hold 3 fancies)

Is it just me being happy with the one tank I have? xD

Haha seems like it nossie! I'm quite happy with just the snails and 90litre tank, the only reason I have crazy plans is to give lucky a better home although I do like to dream about different tanks and what set ups I could have someday...

YOU could KEEP GOLDIES IN A SMALLER TANK PROVIDING:
 A) THERE IS ADEQUATE SWIM ROOM (LENGTH)
 B) SUFFICIENT SURFACE AREA FOR GAS-EXCHANGE
 C) FREQUENT WATER CHANGES

GENERALLY SPEAKING , THE LARGER THE TANK, THE EASIER IT IS

I want bertie around for a long time.  If I'm doing this...I want to do it right.  I knew buying the smaller tank...that at some point I would be moving into a bigger tank.  I figured the smaller tank would give me an opportunity to see if it was a hobby I would enjoy. 

I'm loving it.  It's a pleasure to watch bertie and the snail crew.

Ah thanks for clearing up there nossie I think a decent width of at least 2ft or so would be good, considering how large fancies can get! Would give them room to turn around!

My new plan, is to have a wooden tank... It can go on the floor, essentially it would be like a mini indoor pond... It would be much safer than glass and the fish wouldn't have to stare at feet all day! Who knows if it's possible, but I will figure it out!

Can you get tanks that are 2.5 foot in width?
I've often seen ones that are only 2 foot in width... 3 foot in width might be possible though?

Oh no sorry I mean width, the side length of the tank 

It was something that I hadn't thought about until the other day, like for lucky I will need a width of 3 foot minimum so she can have space to turn around properly   otherwise for commons as it was pointed out to me, something 6ft x 2ft, would effectively be like living in a corridor!