Predator Haps - advice needed

I have been planning out my 125 stocklist with the help of a few members here and have switched from a Hap/Peacock setup to purely Hap. I was trying to stay with all peaceful temperments, but that's fairly difficult to do with haps.

I have never kept predator-specific fish, or such large fish as those I plan on aquiring.

How do I meet the needs of predator haps without relying on potentionally hazardous feeder fish?
Will all these fish be suited for a 125? It's a 6 ft tank, but I'm talking multiple 10", 12"+ fish.
Even as predator haps, will the aggression be taken out on my Phenochilus Tanzania (star sapphire)? I am just concerned about the "peaceful" temperments with the "mildly aggressive."

Stock list as of now (w/ expected max sizes):

Dimidiochromis compressiceps "Malawi Eye Biter" - 11"
Nimbochromis linni - 14"
Hemitilapia oxyrhynchus - 8"
Placidocromis johnstoni "solo variant" - 9"
Sciaenochromis fryeri (Maleri Is.) - 7"
Protomelas sp. "Steveni Taiwan" Taiwan Reef 7"
Mylochromis lateristriga - 12"
Otopharynx lithobates - 5.5"
Tyrannochromis nigriventer - 14"
Lichnochromis acuticeps - 12"
Exochochromis anagenys - 13.5"

Minus a few that I enivtably won't be able to find/afford.

Side note - I intend on selling my Flametail Peacock pair before putting any larger/aggressive haps in :thumb: