So just to try and recap myself here its a 160 litre tank 100 x 40 x 40cm and you have 24 fish that are schoolers (I can't remember the species but I think they are Tetras?)
A couple of colourful fish that don't need the bigger numbers I can think of, a pair of Laetacaras might be a good choice - Dorsigera is a personal favourite. A subtle beauty but definitely there. Some of the Stiphodon Gobies feel like they could be a good contender, a group of 5 is usually advisable but they do get good colours. How about a small colourful Pleco or Whiptail? A Blue Panaque or a Flash Pleco could be good but I'd choose Red Lizard Whiptails as they are a more slender, less mess producing species. It would be an either or with a cichlid but some of the Badis and Dario species could be an option here - you could potentially keep a small group of these with an upper level Gourami, I'd probably look at Sparkling or Croaking Gourami.
I think I'd probably be looking at the Badis/Dario species with some Sparkling Gourami and the Red Lizard Whiptails - probably a trio of each species?
Wills
A couple of colourful fish that don't need the bigger numbers I can think of, a pair of Laetacaras might be a good choice - Dorsigera is a personal favourite. A subtle beauty but definitely there. Some of the Stiphodon Gobies feel like they could be a good contender, a group of 5 is usually advisable but they do get good colours. How about a small colourful Pleco or Whiptail? A Blue Panaque or a Flash Pleco could be good but I'd choose Red Lizard Whiptails as they are a more slender, less mess producing species. It would be an either or with a cichlid but some of the Badis and Dario species could be an option here - you could potentially keep a small group of these with an upper level Gourami, I'd probably look at Sparkling or Croaking Gourami.
I think I'd probably be looking at the Badis/Dario species with some Sparkling Gourami and the Red Lizard Whiptails - probably a trio of each species?
Wills