He's got a 3 gallon tank with filter and bio filter and I'm washing the plastic plants in the dishwasher right now to sterilize. He hasn't eaten yet, and I've tried three different foods (flakes, bloodworms and Hikari Gold) but I'm putting that up to new home jitters. He is grabbing air often and blowing bubbles under part of the filter's plastic. Is that what a bubble nest is?