I have a moderately stocked 110 tall 48"x18"x30" full of mbuna with a couple of pleco's and other random fish in there. Because of how my rock work is stacked the cichlids occupy mostly the top 2/3rds of the tank while the pleco's roam, leaving the bottom relatively empty. I was thinking about adding a group of either zebra or yoyo loaches(I don't like clowns all that much). I know that with any loach they will have to be watched for aggression, but if that's not an issue than what species would be a better match with my setup. The yoyo's would get a little bigger so would that make them more likely to thrive with the other inhabitants? Also how many of each number would work with my footprint?