hi i am currently keeping a 125 litre tank with a built in filter and heater. I am currently keeping three rainbowfish, 6 platies,1 guppy and two female bristlenose catfish. I have had this tank running since march. I would like to keep some kind of cichlids as i would like some colour. Am I able to keep them with my current tank mates or is beter to start again. Ani help will be a great help. Thanks Tom 