how long till theyre fully grown and is there any way I can increase my males hump he does not have one and when do they form one


For a kok or nuchal hump it depends on genetics water quality and stress level. Crystal clear water healthy diet and dominance in the tank. Also other factors are involved too
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They do not usually show the hump until mature, and yours are still very young, and they really start to show around 10"+.
It is also usually only a dominant male that will show.
Yours need to put on about 5 more inches before dominance factors come into play.
My dominant male carpintus just started to get a slightly stronger profile at about 7" back in July.
Same male in Oct, add an inch
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