I have seen several posts with people saying their fbt swims in circles yet I have never seen an answer worth a ****. The fact its the newer one would bother me. I bought a newer little guy. The smallest fire belly I have ever seen actually and he is the absolute worst hunter. My only suggestion is try different bugs to get him to eat. Sometimes they seem to lazy to chase something down when they are sick. Try fruitflys. Sorry I'm not more help.