I would just do a school of dithers
Good size catfish such as the Syno's / Pictus for the bottom and some giant danios for the upper levels. Other options would be a dwarf Pleco (or pair), any barbs except cherry should be fine, or congo tetras. If you want another cichlid you may get away with a firemouth, maybe a severum but that would depend on the Dempsey. I'd stick with the giant danios and a couple of catfish only if you do want another cichlid though. Balancing out so that you get fish that swim in differnt areas to the cichlids is important as (particularly Dempseys) need their space. I probably wouldn't go much above the inch per gallon rule if you're trying to house a Dempsey.
1 x Dempsey 10"
6 x g danio 24-30"
3 x pictus 15"
1 x Severum 12"
Gives you total when fully grown approx 65", so you would prob be ok.
Good size catfish such as the Syno's / Pictus for the bottom and some giant danios for the upper levels. Other options would be a dwarf Pleco (or pair), any barbs except cherry should be fine, or congo tetras. If you want another cichlid you may get away with a firemouth, maybe a severum but that would depend on the Dempsey. I'd stick with the giant danios and a couple of catfish only if you do want another cichlid though. Balancing out so that you get fish that swim in differnt areas to the cichlids is important as (particularly Dempseys) need their space. I probably wouldn't go much above the inch per gallon rule if you're trying to house a Dempsey.
1 x Dempsey 10"
6 x g danio 24-30"
3 x pictus 15"
1 x Severum 12"
Gives you total when fully grown approx 65", so you would prob be ok.
There is no way this would work. 6 tetras or danios and the jack. Never try to use the inch per gallon rule with sa/ca.
What is the foot print of the 65? 48"x13" or is it longer? The foot print is more important than gallons. if its a 48x13 most large sa/ca cichlids will claim the whole tank as a territory and aggression will be an issue when they become adults.
Would a 48 inch 75 be better? Not sure how much space I have...