you've been told many times the same thing and you never folow any advice, why do you even bother asking? if what you want to hear is to get 10 oscars, 6 clown loaches and 25 common plecos, then go ahead and get them!
cram them in you 15 gallon and watch the water turn yellow in half a day and your room will stink of death
every time you post it is the same question and you receive the same answers. just follow the advice you are given and things will work out, otherwise do what you want but quit saying your fish are dieing cause everyone here knows they're gonna die!