how often should i clean my 6 gallon fish tank?

its bad not to have a filter your fish could die because the filter is what give s your fish clean oxygen and without it your fish will die so you need to consider a filter and cleaning out every 4-7 days and get some oxygen pelliets at wal-mart if yu aren't goig to get a filter so your fish won't die
 
clean it wih anything you like, fill it up with colorful stones or make it a vase for flowers. Your 2 orandas need at least 40 gallons filtered and aerated or they are dead soon.
 
without a filter id say once a week do about a 40% water change. you need to get a filter and air pump its helps allot with the water quality
 
Goldfish are very messy fish. They create a lot of ammonia, and orandas reach an adult size of 6-7 inches (just google it.) One goldfish needs at least 20 gallons and then 10 additional gallons for each extra goldfish.

Point is, your tank is too small. At this point, you should be doing 25% water changes every day to keep the ammonia levels down. Don't be mislead into thinking that they will not grow that big because you keep them in a small tank. Lots of problems can occur if you don't provide them with enough room.

I'd suggest either replacing the fish (returning them to the store, DO NOT release them into the wild. In most states that is illegal and can cause huge problems.) with a betta or some shrimp or get a larger tank (craigslist has lots of cheap tanks.) You will also need a filter. If you don't have a filter, you shouldn't have fish. It is vital to their health.

I'd recommend joining an aquatic-related forum as well to get quality information from experienced people who know what they're talking about.
 
it is good to change water in small quantities but frequently...

with goldfish in ur tank , i suggest u change at least 5 ltrs of water in space of 3 dayz...
 
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