Hi Oldfishlady, I thought water quality is the key to successful breeding. Why do people here still have problems with breeding and only get a few survive to adult.
In 1981-1982 I randomly counted the fry of spawns which averaged 1000. So 200 is a bad result IMO. That's why I gave up caring for the fry and just accept what I get (my average is 200-300 if I care for them).
I don't want to post this publicly to avoid discouragement (?) and offend people. I hope you don't mind my messaging you like this.
Anubias-nice plant that needs to be tied to something-like driftwood, rock, decoration with a cotton thread, you don't want to plant it in the substrate because it can cause it to die. It is a low light, slow growing plant and great for Betta tanks.
I don't think it is age related, I would still do a water change to rule that out as part of the problem.
A good rule of thumb so-to-speak...anytime you have a behavior change-check the water temp and make a water changes even if you just did one earlier in the day or week.
To rule out environment at part of the problem-anything could have fallen in the tank, hands, sprays, oils etc.....and water temp is also very important to check.
How old is he and how long have you had him? how is his appetite, how big is the tank, water changes, additives, live plants, filtration..etc...
Often when a Betta has a change in behavior making a 50% water change can perk them up and this will also help rule out the environment as the problem.