You have to trust that I'm not trying to cause trouble, I'm trying to help... Let's do this one fish at a time...
Dempseys. First off, they are Central American and can definately thrive and spawn in 8.2 PH. I know because I have three in my tank... two of which have been raised here from eggs. JD's have been here since the 50's you probably have the millionth generation...
http://www.cichlid-forum.com/profiles/species.php?id=23
Green Terrors. Gt's are South American ( I also have these and have bred them here) I've got one in the big tank too, doing just fine in 8.2
http://www.cichlid-forum.com/profiles/species.php?id=502
Blood Parrots. BPs are from some crack aquarists back yard and they wouldn't have a clue what PH even means... LOL I'm not a big fan, can you tell LOL
Firemouth. FM is another Central American Cichlid able to withstand PH from 6-9, thrive and spawn... I just sold off the last remaining fry I had here...
http://www.cichlid-forum.com/profiles/species.php?id=65
Jewels. West african... LOVE the high PH... LOVE LOVE LOVE it! I've hemichromis crystiatus here, a breeding pair with a gaggle of fry and more eggs laid! LOL
http://www.cichlid-forum.com/profiles/species.php?id=1348
Severum, South American also, what kind? I've spawned rotkiel and green... In 8.2
Noticing a trend?
http://www.cichlid-forum.com/profiles/species.php?id=2449
Bumble Bee, mbuna from lake malawi where 8.5 is just fun.... LOL Bred them here about four years ago... In 8.2
http://www.cichlid-forum.com/profiles/species.php?id=845
I'm tellin ya, you've got common fish, none of which are particular about PH what's so ever... The proof is in my Breeder Award Points (B.A.P.)
So, that's:
2 Central American with a Reccomended, 2 South American, an African, a West African and a hybrid... That's quite the mix! I can dig it... All but the BP LOL Again, just me LOL
Just trying to help man, I've been at this for almost 25 years, bred a lot f cichlids and have NEVER EVER adjusted my PH!