So a few days ago I cleaned out the Fish Tank for my goldfish because it was getting on the dirty side. I cleaned it head to toe as i usually do, filled it up and waited for it to get to room temperature. So at 3pm i put the fish back and the next day i find that they died.

So i cleaned the tank again just in case, and filled it up. I did research on many fish - betta's gold fish and guppies.

i have a 3 gallon tank, and my room temp is 67.
I got a pet Betta fish. it's red. I kept it in a separate tank until this morning when i put him/her in the bigger tank in order for the chlorine to get out of the water. .

But people are saying 3 gallon tank is not good for any fish. But i'm curious why would stores sell them if they weren't good for any fish since people are saying that you need at least a 5 gallon for 1 goldfish.

Well i have a 3 gallon tank and i've had mine for years,i do have a pump as well i also put that chlorine stuff in the water when i do a complete change.When we were kids goldfish survived for years in those little round bowls so i'm sure it's not the size that did it,have no idea why it happened

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i don't use that chlroine stuff. never did and the fish lived well. too well in college i had to give away the tank to someone w/ the fish. lol.

Stores sell things that they think people will buy like smaller fish tanks, tiny bird cages, and bad dog food. It's cute and traditional to see fish in small bowls or smaller tanks. Those tanks take up less room and are more appealing in that way. Goldfish are really messy fish because they go to the bathroom a lot. They get really big too so a bigger tank is better for them and easier to keep clean. The fancier goldfish like the Bubble Eyes or Pom Poms are more fragile than the Comet or Fantail. I find that most goldfish are not as hardy as Bettas, Danios, Tetras, and fish like Mollies.

Betta fish are really hardy for the most part and do well in smaller tanks like the 3 gallon that you have. It seems like Betta fish can survive most anything that a lot of goldfish and other fish can't. I've had Bettas that last many many years with little care except a clean tank and food.

Maybe your water quality changed because it was all or mostly new water in the tank. Water from the tap is not always going to be the same so little changes like more chlorine or whatever could have been in your water. I used to just use tap water until I learned more about keeping goldfish. I did add water conditioner each time to remove the heavy metals and chlorine. My fish usually survived, but I had a lot more casualties. I eventually got my tank balanced, and I was able to keep my goldfish really healthy. I had some huge and really fancy goldfish when I was in college, and I would likely still have them if I didn't have to move far away from where I had them. The beneficial bacteria in the water are good for the fish so make sure you are not changing out too much water at once. If you want you can get a free water quality test at a pet store or you can buy a kit to test the water yourself.

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I recently started our aquarium. It's a 20 gallon and right now we only have 4 guppies; because we know we need to cycle the tank. This is basically setting up the biological filter. There are a couple ways to do it; including frequent water changes, or using bacteria from another established filter. If you don't have a filter (which eventually you can get balanced with the right bacteria) you'll need to regularly change water. But of course you want either bottled or treated water to remove the chlorine. Simply put, without thebiological filter the fish eventually die due to the toxic ammonia and nitrites caused by their waste. With the right bacteria established, the environment balances out. I'm glad someone pointed this out to me when starting our tank or I'd probably end up with a lot of dead fish.. =( most people think they can buy the filter & pump and be set. But that's not the case... cycling the tank is the most important thing in keeping fish alive!

Tips for Cycling Your New Aquarium - The First Tank Guide - Getting Your Fish Tank Up and Running with Minimal Headaches

All that said, bettas and goldfish have very different care requirements. I currently have my 20gal setup that just has guppies for now; but I also have a separate betta bowl. For the smaller bowls that don't have filters, regular water changes are a must.

Also, golfish are coldwater fish. Whereas a betta prefers a warmer climate. That said, though, putting a heater in a 3 gallon tank can actually be dangerous.

Here's a good link to some info about betta housing (and the Home page has everything else you'd ever want to know!
housing
My last betta lived 6 years, I really loved that little guy!!

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Goldfish are really dirty, as in they produce waste VERY quickly. A single goldfish requires 20-30 gallons of water just to itself, soooo many die off early because pet stores sell them just like betta! They're really pond fish, like koi.

You should get your betta a five gallon tank! They're not very big and you can safely heat it to the tropical temperatures your fishy needs. They even sell stick-on heat mats for the bottom of betta tanks, so you don't have to take up room in the tank itself.

my betta fish seems to be doing pretty well.

My daughter has a small tank maybe 3 gallons and she has 2 popeye goldfish and a betta in there been alive for over 2 years. It has a pump filter etc. When I change it out I just use that chlorine remover and that's it no heater no testing water or anything else they have lived a long time so I guess they are fine lol.. I have had a larger tank in the past and I never tested water or anything and they lived a long time also. I actually gave them all away when my tank started leaking . It seemed the less I did the better off they were lol..