Dinogrrl
Songster
A little algae on the sides of the tank is not the end of the world. A snail can take care of that just fine, or just a gentle scrub with a sponge. The film on the top is more worrisome because the betta needs to be able to breathe at the water surface. If you don't have a filter and/or bubbler to break the surface tension to keep it moving and scum-free you'll need to get one.
Is the tank sitting near a window or otherwise in a place where it gets sunlight? Do you use artificial lights and if so, how long are they on during the day? If the tank gets a lot of light, limit the amount of time it's lit up. Excessive light, especially sunlight, can lead to algae blooms.
Is the tank sitting near a window or otherwise in a place where it gets sunlight? Do you use artificial lights and if so, how long are they on during the day? If the tank gets a lot of light, limit the amount of time it's lit up. Excessive light, especially sunlight, can lead to algae blooms.