What size is his tank, both volume and dimensions - it's a 20L tank 26.5cm (H) x 39cm (W) x 24.5cm (D)
Does the tank have a filter, and if it does what media are inside - I have a sponge filter currently running in there I was told I didn't need to add anything to it.
Does the tank have a heater, and if so what is the water temperature (the temp of the water not the setting on the heater) - There is a heater and water is usually around 80F
What are the ammonia and nitrite levels (after 6 months it should be cycled but something could have happened to harm the bacteria) 0 amonia nitrate and nitrite
How often do you do water changes and how large - I do 25% water changes once a week but have been doing these every 2nd day since everything started going down hill.
What do you feed him - Hikari betta bio gold floating pellets
Are there any tank mates (fish, shrimps, snails etc) No tank mates
What decor is in the tank - ornaments, plants (real or fake) etc previously there were live plants but as I was given the wrong information about them they died off and caused a lot of issue with water parameters. Currently there is one fake plant and a Buddha sitting in the middle of the tank, the plant is maybe just under half the height of the tank maybe less and the Buddha is about 3/4 of the height of the tank