i have a tigon 190 liter tank,just worried how many fish to put into it,i have 2 platys,3 mollys,7 zebra danios,6 rummy nose tetre,1 common plec he is 3 inchs now,1 afican butterfly fish,2 sliver dollars,2 yoyo loches, i do 25%water changes every week cycle done,test every week all good...