agreed
8 inch plus must be a bigger tank
or they might get cabin fever
i suggest getting more.
endlis are big
ornates are big
meaning they have big attitudes.
maybe add some senegalus or delhezis or palmas in there.
this way there are many distractions for them so they dont pick on each other
as for stunting growth
hope they are not
in my country, itsa lucky dip some are stunted from the lfs cos they stay in small tanks too long and fed little.
theyare big fish so not that many people buy them.
so hope this is not the case with you.
sometimes you get a runt, this is bad luck
i have 4 dels, from the same tnak in the lfs.
2 are getting big, one is slightly smaller
but the 4th is very small, doesnt seem to wanna grow but has a big appetite.