so... if you recall I had a death in my sunset thick lipped gourami tank and aggression so I divided the tank and separated the remaining two. Well now the bigger one has lots of bubble on “her” side , if they are young do they start yellow and turn rust later? I’m wondering if this could be a male even though many people said she’s female. I did change the carbon filter Monday but not sure that would be the cause. I’m very careful when doing anything in the tank, it’s just weird with the sudden bubbles.