I've used mosquito netting for my screen. Bought from my local hardwareNo, but you've bought up a good point JG. I've had wrasse jump to their demize. The clowns I've had since early 2019 and they are fine. I've ordered Alu profile to make a frame for a screen. Next mission is to find some screen
Thanks @Afsal! I acrually bought some mosquito netting from my hardware which should work, thanks for the advice though!I've used mosquito netting for my screen. Bought from my local hardware
you need some substrate though 
@JG Beeslaar, As the mangroves grow they should continue growing around the deadwood. I'm recreating a lagoonal environment and the technique is used in bonsai called Jin. Unfortunately because I can't wait for these very slow growers to produce enough growth to purposefully kill off parts of the plant I have just added some driftwood. They are also susceptible to harsh trimming especially early on. Note that the wood is on top of the water and nothing extends into the tank. Instead, it sits on top of my rockwork made to look roughly like the roots or stump of a mangrove.If I may ask. Why is there wood in?