Glad to hear your Hongi made it - next time, see if you can get the fish kept in separate bags if possible to prevent fighting (I've once had 2 male Greshakei in one bag - in the 30mins they were 'together', the bigger guy hurt the smaller guy REAL BAD).
Melafix & Pimafix are great preventive meds, as well as great 1st resource meds. Won't work for some serious cases, but it's my 1st resort. You should get them.
Neat tank BTW.
As to Bobby's fish - I've encountered cases similar to yours, but usually due to an 'accidental injury' such as 'hitting the rocks' (literally). I have a one-eye Electric Blue too.
Oh, and Malawi Hap can go crazy too ... my one-eye Electric Blue went crazy just over a week ago - was chasing my poor Oto Lithobates male all over the place (hiding places included!). He's now in 'detention' until I try putting him back again. (I think he's frustrated that the female Electric Blue isn't interested in him).