You need to get more distance between the tank and background. It's casting the notorious 'shadow line'
At least 30cm will get rid of this issue.
Looking REALLY great Iain. What a shame to take it down. Get another tank instead!
Funny looking back isn't it? - all the care taken in selecting the right shape and positioning of rocks and wood, when all that mattered really was the shape of the little bits of wood sticking out15kg of minlandscape rock was a waste of money ady Looking back at this there were so many things that were wrong hardscape wise at setup. Need to start figuring out how to build height that will last long term for the next one.