it has it's little feelers out when I feed but it still has small bubbles. I feed it all kinds of foods like, krill, shrimp, silversides, and mysis shrimp. I do use b-ionic supplement in my water for cal and alk but you need to make sure you test for those before you start doseing and check it every week at least to keep it level. I dose every day. I tested every day until I got it level now like I said I just test once a week.