Valkyrie_Lips
Fish Crazy
Nutrafin bug bites are a fantastic food to add to rotation. They have a betta formula but I personally use the s/m cichlid one since my betta is pretty big and I just prefer them.
Even if your water tests okay I would still increase the amount and frequency of your water changes to see if clean water helps him perk back up.
If that doesn't help then he could be stressed out by his tankmates. Bettas aren't really good community fish and prefer to have their own territories sans other fish. Some bettas get aggressive towards tankmates, others hide from them because the activity level of smaller fast fish can stress them out.
Even if your water tests okay I would still increase the amount and frequency of your water changes to see if clean water helps him perk back up.
If that doesn't help then he could be stressed out by his tankmates. Bettas aren't really good community fish and prefer to have their own territories sans other fish. Some bettas get aggressive towards tankmates, others hide from them because the activity level of smaller fast fish can stress them out.
