I have just installed a heater in my 60 litre tank which i have been running with cold water for a couple of years. I currently have a couple of pearl danios, a weather loach, 2 paradise fish, leopard danios,2 white cloud mountain minnows and 2 neon tetras. I am looking to add something with a bit more colour brighten the tank but want something that will mix well with the others too, any suggestions. Also on one of the plants on the underside of the leaves there are browny coloured spots, any idea what these are?

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