Your current Fish tank Setups!

[Malt_Vinegar]

Finally back in the thread I created many years ago, with a new tank
My Daughter had a small tank in the playroom. It was just a circa 50L that was not really very well setup, so after moving house, we decided to get something a little nicer, as the room also doubles as a guest room. I needed no excuses to get something new going!!

Found an 80 litre locally, and went to grab it.

Decided to go sand based, planted, with bogwood, and reused a lot of this from the old tank. We also wanted to see if we can get some plants growing aquatically, out of the top of the tank, and this design was going to work nicely:

I have 3d Printed some plant baskets that hook into the rim of the tank, and dangle the roots into the water. As well as planting some fast growing stuff in the sand.
So far the plants are enjoying the environment, and the fish are doing ok. We have 3 swordtails, and also 6 Rummy Nose Tetra. Currently running a new Fluval 207, with some matured filter media.
I also 3d printed some light risers for the tank to bring the light further away from the plants, as they were starting to brush the bottom of the lens.

Tank top detail:

You can see some of the baskets, the light for the fish, and plant varieties

The business end:

Not happy with the cylinder planter at the back, so will design/print something a little shorter to keep the roots only in the water, like the others!

 

[Malt_Vinegar]

Hi I found a tank, the woman at pets at home said its a 55 gallon tank I think

She said Its only big enough for one fish. Is that right?

I was going to get one of the big goldfish.

It's a cold water tank.

Goldfish, yes 1.
You could get other types of cold water fish if you would like more. However, you will generally be better off going tropical if you would like a larger selection.
This would mean you need a heater.
You will also need a filter if you do not already have one. You will then need to leave the tank running to cycle it. This is essentially letting the filter build up beneficial bacteria. It can take a few weeks.

Do you have a picture of the tank?

 

[Malt_Vinegar]

24 hours is not accurate really, that will mean you will be doing a "fish in" cycle.
If you are going to do a "fish in" cycle (which I am an advocate of personally) you will need to be testing water parameters daily and doing large water changes for the first couple of weeks at least till the parameters are correct.
It's more work, and if you don't do the work correctly you will lose fish.
I suspect a golf fish will be more hardy than tropical for a fish in cycle, but i have not kept cold water for decades, so not sure.

Additionally, I am very doubtfully that is a 55 gallon tank. That's a 200 litres.

That looks more like a 40/50 litre tank to me.

That's my daughters 80 litre tank for reference