This is a discussion on What's wrong with her? within the Tropical Fish Diseases forums, part of the Freshwater Fish and Aquariums category; -->
OK, with the complete water change you're likely to set off another cycle so it's important you monitor the parameters in the tank. With ...
OK, with the complete water change you're likely to set off another cycle so it's important you monitor the parameters in the tank. With her being the only one in there I'm not really sure how much of a cycle you'll get but still...it would have been better if you'd done a partial water change. Don't feed her for now, it's possible this is a swim bladder problem and food will at the very least press up against it and make it worse. Were you feeding her betta pellets or was she eating the same thing as the other fish?
Complete water changes are never needed and will do more harm then good. The gunk growing on your rocks was probably nothing to worry about. But the beneficial bacteria lost in the tank cleaning is a concern. Watch your water parameters very closely over the next couple of weeks and don't be surprised if you get a mini cycle.
It sounds like your fish could have a swim bladder problem, You said she looks bloated? What does her poo look like?
When I clean my ten gallon, I just do 10 - 15% water change twice every week. You should try that, or like 20-25% once a week. It never fails and keeps your tank in good balance.
I agree, 100% water changes are never necessary they always cause harm. If you ever get algae or bacteria growth again, take out the decorations and scrub them good in hot water and scrub the sides of the tank, but don't change all the water.
Since you did the 100% water change you need to test the parameters ASAP like has already been suggested. Once we know those we can help you more.
Well I'm only in high school and completely jobless, I do alright. Lol nor do I drive.
But thats alright, I understand now isn't the best time but you should really use some of your money for your fish, Like a gravel vacuum won't cost more then 15 bucks. And the water tester... I don't even know, mine was kinda pricey. It depends on your location. But we can't really help you until you can give us more information, we don't really have much to go on, sorry.