Thanks for all your comments. Yes the background plants are growing like crazy & need regular trimming. At the moment I'm not injecting CO2 but adding excel & EI ferts. I'm hoping the recently added foreground & carpet plants will do the same & fill in the gaps. I mix 50/50 RO with tap so my water is quite soft, the fish I have are doing great too. I only wish I new what I was doing, but I don't lol. Just following advice gained here thanks to everyone. Leaps of faith & crossed fingers.