Hi!
. As this does not seem normal and could very well be a sickness, maybe wait to see and pick up on Sunny’s behaviour. Is he more hyperactive then usual? Or is he slow and a little more depressed than usual? My axie, Frankie, has very long gills and I see Sunny appears to have smaller gills in general. This could perhaps either be just a feature your axie has or if Sunny is young, maybe this could be his gills growing? Monitor his behaviour for a while and keeping feeding Sunny by a regular routine and if your see and changes, contact me and we maybe could try to find a solution together.
I hope this comment helped! I hope Sunny is okay and happy
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