hello all i am new to fish keeping and have a fully cycled fluval 125 (125 litre) tank. it currently has 3 platys and 4 neon tetras. i will be getting more tetras possibly 6 more but was wondering if anyone had any ideas as to what other fish i can get. i want them to be colourful but get on with the fish i already have! ps i also want a 'cleaning fish' any advice is greatly appreciated!