The local breeder that I previously mentioned, never once had a case of bloat in any of his tanks. He knew from experience not to mess with things, once the fish were settled, and hierarchy was established. The only time he put his hands in his tanks was to remove holding females, to strip fry. But he was methodical, and careful not to stress the colony out. At one point his 2,000+ gallon fish room consisted of the following Tang species.
Tropheus Moorii Kambimbwe Red Rainbow
Tropheus sp. Red Chimba
Tropheus Moorii Ilangi
Tropheus moorii Bemba orange flame
Tropheus duboisi Maswa
Tropheus moorii Ikola Kaiser
Tropheus moorii Kiriza kaiser II
Tropheus moorii Bulu Point cherry spots
Julidochromis transcriptus Gombi
Julidochromis ornatus
Cyprichromis leptosoma Utinta “Fluorescent”
Paracyprichromis nigripinnis “Blue Neon”
Cyathopharynx foae sibwesa
Cyathopharynx foae kekese
Opthalmotilapia boops neon streak
Cyathopharynx foae mbita
Cyphotilapia frontosa Mpimbwe blue
Neolamprologus brichardi
Neolamprologus "daffodil"
Neolamprologus leleupi
Neolamprologus cylindricus
Neolamprologus multifasciatus
Enatiopus (Xenotilapia) melanogenys
Xenotilapia spilopterous mabilibili
As far as dominance, and hierarchy within a group of tropheus - I once watched a young male black Bemba, maybe an inch in total length, aggressively defend a sponge filter that he had laid claim to, keeping the rest of the fry/juvies in this otherwise bare grow out tank, at bay. So in a tank your size, with only two males, there's really no getting around the inevitable, and adding more males at this point is out of the question. The two males will always fight, no different than two boxers forced to live in the same ring. It's simply in their nature.
