Have 2. 220 gallon tanks with Africans. Just recently cut the seems and made one tank.would like professional opinions about mixing. The two speicies? ???.plenty of hiding places and open water its a 440 gallon tank now.2wet dry filters.2power 2 skimmers..no fish under 4 inches at this point.there is 38 Africans in it now.great project. Seal are perfect looking and holding for 8 months.will put up pics soon