125 liters is a great sized tank for dwarf cichlids or even medium sized like Rainbows or Blue Acaras
First we can explore the idea of Rams if you like them though
Firstly you need to split them into the two appropriate groups - Bolivian Rams and Blue Rams (Blue Rams include all the colour morphs available)
If you go for Bolivians a group of 4 will work great they are slightly gregarious cichlids and will appreciate the company with these I would keep things like Cories, Pencil fish or Tetras and you could even go for a trio of spotted headstanders - a small LDA10 red lizard whiptail would work nice as well.
Or if you go for the Blue Rams or any of the brilliant colour morphs two pairs could technically exist in that tank but would be risky and you might be better off getting a large group of young rams and letting them grow out and try to find the pairs in this case oyu may only find one pair you may get two it is hard to tell. If you did this I would look into the needs of Blue Rams which are often high temperatures and low ph - the low ph can be achieved easily via peat in the filter or almond leaves in the tank which you can get off ebay. In this tank set up the best tank mates are a large school of Rummy Nose Tetras and a large group of Sterbai Cories - these are fish commonly kept in these conditions with discus and also translate into this situation as well.
Just as a curve ball a pair of Rainbow Cichlids with a group of Dwarf Hoplos, a trio of Sword Tails and some Red Eye Tetras would be a great cental americanish biotope as well
Tall Tree - its great to help out but the amount of guess work that went into your replies is slightly concerning. In this case the OP would probably have been okay but guessing how many cichlids to put in a tank is always way to risky espeically when there are so many great resources to learn from out there - some dwarfs can take up a surprising amount of space like some apistos would want this whole tank to a pair or trio depending on the dominance of the females where as Laetacara are documented as taking up a roughly 6 - 7 inch square of territory - though thats not to say you use that as a ruler accurate rule. Also as a flip side - in the wild Apistos live in huge colonies during the dry season with often literally hundreds if not thousands in a few meters of a small creek - though this is very hard to replicate in a tank though I imagine it would follow a similar method to African Cichlids where you overstock and over filter on purpose but its not a particularly tried and tested technique in tanks and was only really discussed about a year ago when legendary Ichthyologist Alf Sthalsberg documented finding them like this. I dont mean to lecture but when people use phrases like "I'm not great with cichlids but I would hazard a guess" I feel I need to intervene.
Hope its helped all round
Wills
