The tank my tank has been set up for about 9 months, it is heated to around 26-27 Celsius and filtered by a fluval U1 internal filter, i currently have 5 neon tetras 2 gold barbs and 1 albino Corydora, I have one plastic plant and a few other fake decorations, being from Norfolk, the water is usually quite hard, I have been doing 1/3 - 1/2 water changes weekly for the last month however, when I initially got the tank it was in direct sunlight and I suffered badly with green water but I have now been able to angle it out of sunlight and the tank light is on about 9-10 hours.
Thank you for the replies!