Okay sorry bout the cycling confusion as i stated earlier - african rule of thumb 1 inch of per 1 gallon of water .....if you ad rusties or whatever.
Personally your limiting your self on abundant color - rusties get about the same size as the saulosi......my math says 7 x 4" is 28 gal's of blue and yellow. Maybe try 5 saulosi and @ 20 gal and 1 aulonocara(peacock)- your wife will luv the peacock.
And your guess-timation on live plants and cycling is absurd bacteria doesn't form in the water it forms on plants, ornaments, filter bags-tubes, etc...In nature god's filtration system is flora.
Personally your limiting your self on abundant color - rusties get about the same size as the saulosi......my math says 7 x 4" is 28 gal's of blue and yellow. Maybe try 5 saulosi and @ 20 gal and 1 aulonocara(peacock)- your wife will luv the peacock.
And your guess-timation on live plants and cycling is absurd bacteria doesn't form in the water it forms on plants, ornaments, filter bags-tubes, etc...In nature god's filtration system is flora.