I just recently got a baby Brazilian rainbow. Recently as in 3 days ago ish. I went to petco to get him some fuzzies, and tried to feed a couple to him last night. He wouldn't take them because they were freezer burned. Something my mom had pointed out. So I went back and got a crap ton of pinkies for 20% off. Tonight, he ate 5. Took them down no problem. I put him back in his tank after that, and since the tank is still fairly new to him, I directed him toward his water, and he started drinking almost immediately. He's been drinking for the past 45 minutes but takes small breaks here and there. The thing I'm worried about is that during these breaks, he lifts his head up a little and I can see that the pocket of skin/scales under his jaw looks swollen like he has water in it. It goes up and down like a frogs throat does when it's croaking. And sometimes he'll open his mouth partially. And he twists his neck from side to side as well. But then he'll just go right back to drinking. Is this behavior normal? O.o