ok so right now i have my 125 set up as an african tank however i am wanting to convert it to a blackwater SA tank and so have to find home for my africans however i have a 20g long that is sitting empty at the moment and i would possibly like to keep a pair or two of the africans i have in there so my question is since it is a long tank would keeping two pairs be possible and just put there territories on opposite sides of the tank or is this tank too small? (i have a pair of yellow labs and maingano that i would really like to keep and see if they will breed i also have a pair of livingstoni but dont really like them as much as the others)