[Feanor]

Hi!
Sorry you are worried about your Betta.
Would you mind filling out the form although you‘ve given some important information already? Just to make sure we don‘t miss anything.

BF Diseases & Emergencies Form

 

[Feanor]

You are really giving him such good care and I can‘t think of anything specific to add or alter.

Could be worth a try exchanging 1 feeding for frozen Bloodworms as they are really nutritious and might serve as a little extra energy kick (easiest to be fed with tweezers).

You could also try a supplement like Vitachem for fish and see if he improves.

His black spots are nothing to worry about and your maintenance and IAL prevented his bitten tail from any infectionSo fine so far.

Leads me to conclude that unless he‘s showing any specific symptoms his slowing down might be age related.