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A closer look revealed that whatever it is was gone, if there was anything. But I have also heard doing large water changes and it can cause a buildup of small bubbles. I need to get a bigger tank for them anyways so it's a good reminder.Mcasella said:It will not be a lump on one side but a bulge across the body where the eggs reside (so if only one side is bulging it is not gravid, on another note your fish do not look large enough for them to start breeding).
Get a picture from above, if you have to catch the fish and take pictures of the lump, a short handling period with damp hands will not hurt it.
It likely is not gravid but is something like a tumor or cyst popping up.