My betta used to make HUGE nests, all the time. I haven't changes anything in his tank and all levels are normal. Is there anything else that could be effecting his attitude or making him not want to make a nest. I did an experiment last week by putting a mirror up up to his tank once a day to make him flare and he started to make very small, quarter size, nests after that.
is it lack of a territory challenge that his causing him to not mark his territory with a nest?
I dont think it is age. I have only had him for 3 months or so and I assume he couldnt have been much older than 6 months to a year when i got him. He has started to blow a few small bubble nests in the past few days, but nothing in comparison to the nests he used to blow. I guess hes fine.