Floating rib? Should I be concerned?

[Tonyx]

Hello, my boy 7 months has always had a lump on his side especially evident when he inflate to float bathing. See pics. When I pet him I can feel is a rib sticking out ..should I be concerned? He doesn’t seem to bother.
Thanks!!
[Click image to enlarge]

[Click image to enlarge]

[CooperDragon]

It's a little prominent, but if it doesn't seem to be bothering him and he's moving around and eating/digesting OK I probably wouldn't worry about it too much. An x-ray would give a better idea about what's going on, but I don't think that's necessary unless it seems to pose a problem. They tend to be quite flexible and I've seen ribs poke a bit like that at time and it's no big deal.

[Tonyx]

Thanks a lot! I’ll keep monitoring in case become more severe.