I'm sorry if hijacking a thread is considered bad forum etiquette, i'm not really familiar with it. But after reading your post I thought my O might also have HITH.
I've been feeding him hikari staple as his main food source while also rouletting hikari cichlid gold & excel. They also get some frozen shrimp 2-3 times a week and they get their occasional massivore pellet which are actually meant for my polys.
I do weekly waterchanges of roughly 50-60%
He's in a 180G with the following tankmates:
5x Firemouth
3x Severum
1x Polypterus Delhezi
1x Polypterus ornatipinnis
My water parameters:
GH: 7
PH: 7.5
Ammonia: 0
Nitrite: 0
Nitrate: 20 (Still need to do my WC after this post)
When it comes to behaviour he's the most chill cichlid in the aquarium, doesn't really like confrontation and just swims away when another fish annoys him.
Thanks in advance and sorry for the hijacking!