you'll never get a 10" Rotkeil imo, i dont even think they can get that big, but yeah you have a point, i just don't want the tank to look empty, so i'm looking at the best way to cram my 3x2x2 and make it as active as possible.
https://www.aquariumdomain.com/adSocial/index.php/red-shoulder-severum/
I did have a pair of gold and a red that used to bredd non stop in a 4ft 260litre no bother with tank mates other than a bit of chasing, fully grown including other cichlids, and this will be a 300litre.