Pointy belly blue kind tetra

Hello,

Hope you can help. We recently bought 4 blue king tetras all are fine except one which has a strange looking belly. Only noticed it today - had them about 6 days. Water was perfect levels wise & due a change tomorrow. All other fish are fine. I've attached a picture.

Really hope you can help.

Many thanks in advance

Hi and welcome to the forum

The fish might have eaten too much or has an internal problem. Monitor it and as long as it is feeding well and doing normal coloured poop, don't worry unless the lump suddenly gets bigger. But chances are it will get back to normal in a day or so after the fish goes to the toilet.

Thank you so much he/she's just been a bit greedy then.
It's my little boys first tank so we are learning! Thank you for the advice. Will let you know how we get on