also i like the ranchu goldfish a lot but how hard would it be to take care of in my instance?

Hello Becky,

Welcome to our community.
Well, Katie already mentioned: Goldfish need at least a 10 gallon tank to be happy and they also need lots, lots of care.
Therefore I agree with Katie. Get yourself a lovely Siamese Fighter. They are cute too, beautiful colours, you can choose iridescent blue, green-blue, red, purple, turquoise. The males do have lovely long fins. But you can keep only ONE male.

(if you would keep 2 males they would fight each other until one dies)

It is easy to care for the Betta. Best thing to do: visit your local pet shop. Have a good look how clean the tanks are. You should see only happy and healthy fish. Be aware that the shop should smell nice... not a rotten, dirty smell . And read up about the Betta fish on the internet.

You like to keep goldfish too, well... if you do have lots of time to test waterquality, to look after them at home, Welcome, we help you on here to give it the best care.

Let us know which way you like to go 

well, you'd need to do a water change with goldfish once a week (only between 5-10% of the water) so generally i test once my water has had time to settle. you'de need tap conditioner and some cycle start to begin with to get your good bacteria happy and to remove any chemicals from the water. if you do go with a goldy 10 will only be big enough for 1 fish and your problem is that goldfish love company, so keeping one on their own would be a tad mean. . . its difficult to know what to say for the best. if your not a betta fan and are def wanting a goldy then there is a lot more to think about 

screw the school get a ten or 20 how often do they check on dorm rooms anyway with the amount of rent u are paying do it

i only check my water 1 maybe 2 times a month u can get strips that will only take 1 min to test the water

u can get away with changing water every 2 weeks 2 as long as u do a bigger water change

You should test the water once a week BEFORE every water change, to determine how much you need to change at a time It'd be alright to just test the pH and nitrates when your tank is cycled.

But before you get your fish, it would be great if you'd let your tank cycle in peace for about a week or two. During this time you could test the ammonia values every other day (every single day if you have a fish there from the start) just to make sure nature's running its course It's good to have a nitrite test available too, so you can check for that once the ammonia starts going away.
And if you keep your fish in the tank from the start, you have to change 10% every day to make sure that the fish won't be poisoned.

"Cycling" means letting the tank run for a period of time (1-2 weeks) to allow the nitrogen cycle to set up.  The nitrogen cycle is a series of biochemical reactions that keep waste products from building up and poisoning your fish.  The best way to let a tank cycle is to put in your treated water, gravel, decorations, and some live plants, set up your filter, and (if you can get it) put some benificial bacteria in the gravel and filter.  I reccomend Nite Out- it's a liquid containing helpful tank bacteria (you'll need a teaspoon to measure it).  Then let the tank run for about a week or two with no fish and test the water using an ammonia, nitrate, and nitrite test kit.  If you need more information on cycling, your pet store may have a pamphlet or a book on fish care to help you.
For most tropicals, the rule is one gallon per inch of fish (goldfish need more).  So I'd say that would work for guppies and tetras.  You might also need a small tank heater.  When in doubt, ask the people at the store for their reccomendations.

What sort of catfish? I'm still considering what to do with my tank once Sunshine moves on to bigger and better things (which may be sooner than expected) and I'm trying to figure out what I should put in the tank. It is 22L so a bit smaller than yours and I do want to keep it personal with one or two fish. Not sure if I can fit two in there though. So I was thinking a betta or paradise fish (not both!!) and maybe something else like a quiet little catfish. So maybe you have some advice, Hanna

Thankyouuu