We have ours in an 8ft tank, around 900 litres. We use Aragonite for substrate.. well rocked.. Vallis does well with the high ph, we have a Giant type Vallis in our set up. We have 2 x 2400 Aquis external canister filters running on the tank, a good filtration is a must (however, that goes for most things)
Will post a pic over later on today, our Frons are still young, so tank is nowhere near what it will be once they grow, we will be landscaping it properly then.