Tyson's Behavioural Change

I failed to report earlier that Tyson displayed an interesting behavioural change after the major water change was performed.
As mentioned a while ago, my partner and I performed a major water change in which we removed all the water and replanted our Amazon Sword into the substrate.
After Tyson was re-introduced into the tank, he began to build bubble nests on the water surface.
These bubble nests were not observed before the major water change!
My conclusion about these results is that, the water parameters were more favourable after the major water change and Tyson felt more content in this new, clean environment and thus saw it fit that this cleaner environment would be conducive to support and sustain offspring!