Thanks kerby. The burundi are around 4-5 inches (depending on individual fish) . I got 2 of them a month for 3 months starting in oct of last year. The mpimbwe are about 1 inch (i got them in april of this year , they were 1/2 inch fry then).
You will like a black sand and black background. It makes a huge difference. I have white sand in my 135 gallon tank and they were still nice and blue in it but not nearly as intense of a blue. I like it so much better than the white sand.