your not understanding...I have other tanks...I have bigger tanks. I don't want to keep these guys like this, but every other tank I put them in they dont work out, they either get messed up or do the messing up, I have no desire to do 50% vacume water changes daily (its in my bedroom so I half to do this one by bucket and siphon unlike tanks in my basement that I just hook the python up to). The Jewel and the other african were put in there to be food...awhile ago, they dont even get looked at. As for being happy...how you could say they are otherwise I dont understand, nobody knows what makes a fish happy or if they can even really be "happy", healthy...they are. Other than the Male Jack, do you see an injured or unhealthy looking fish?
No they actually all appear heathy. Cramped, yes but they actually look quite good. And at least you are aware of the situation and not coming on here saying "look at my tank and how there are no issues with it". I think it's just going to be trial and error with different combos in some of your different tanks.
I couldn't imagine doing 50% water changes daily, but at least you are doing them to keep the bio in check. I would start trying different fish in different tanks though, just for your own sanity lol
Good luck!