Instruct: Classify Amazon reviews into positive or negative sentiment
Query: perfect size for a betta and a snail buddy

This is the perfect starter tank, you just add a small tank heater, gravel, some decor, conditioned water, and fish! I have found that the pump works best when the water level is to about a 1/2 inch from the rim (covering the bottom of the pump assembly), otherwise it sometimes just makes noise without moving too much water.