Last night we adopted a small female betta. She's beautiful. Purply colors and mostly whiteish fins.
She's in a 2.5 g Deep Blue tank that is made for 5 Bettas (shiver). No heater yet as the one we got wasn't fully submersible like we thought it was, but the water temp is holding steady around 74.
I tested her water in her cup (got her from a chain store) and despite looking clean, ammonia was about 2ppm
I'll post a pic when I can.
We're interested in doing a sponge filter maybe, as this tank is long and not too tall. I know nothing about sponge filters.