Hi. I am new to joining this site, but have read a few posts and am impressed with the knowledge. I am hoping to get some help on stocking my 125 gallon tank. It previously had rainbows and congo tetras and cherry barbs. I have 3 rainbows remaining, 1 congo and a few cherry barbs. I will be moving the cherry barbs. I am wanting to get cichlids. I have one electric blue acara (2"). I am wanting to add a rotkeil severum and either geophagus sveni or tapajos. My question is, will a single fish of those species be ok and work together? I will probably also be adding a small group of Denison barbs, or get more congo tetras again. Thank you for any help!