Thank you for responding. Here is the information you asked for:
Video of betta swimming:
1) This is a 9 gallon Fluval Flex
2) The take has 1 betta, 4 lamp chop rasboras, and 2 otos. And some ramshorn snails that snuck in on some plants. There are live plants: vallisneria, anubius nano petite, a few crypts, red root floaters and some java fern.
3) Temp: 78.6 deg. F.
4) I've had the tank 7 weeks. I did a 1 month fish-less cycle (with the plants). Put the fish in just under 3 weeks ago. Did my first water change (about 25%) on Saturday.
5) Filtration. I use the built in filter that came with the flex. It has a sponge, carbon, and biological as part of the filter. I also have an air stone in it.
6) I used an API 5 in 1 test strip ph: 6.5; ammonia, nitrite, and nitrate all appear to be 0.0, though I'll be honest I'm very new to testing water parameters. But, I believe I"m reading that correctly.
7) I feed the fish a few crushed spirulina fish flakes OR Hikari freeze-dried blood worms each morning. I also put in a broken up algae waffle every few days for the otos and snails.
8) The fish were the last thing I added. This was about 3 weeks ago.
9) I did not quarantine as it was a new tank and all the plants and fish were purchased from the same place.