Welcome to the forum. I joined in Feb. too. I too am working with a 55 gallon tank, converting over to Africans. It currently house about a dozen mollies, 4 each regular and black neons, a 5" red tail shark and some cory cats. I just bought 6 quarter-inch size yellow-tail acei fry at Aquamania, and plan to add the yellow labs that were recommended to you as well. I also have a 45 gallon tank that has a bunch of Krebs (5 of which I bought for a great price at the meeting auction), 3 koi angles that I bought at the meeting auction, a couple of older silver dollars, a 6" brown pleco and several chinese algae eaters. Also just added a couple of assassin snails.
Regards