i have lined the botom of my water dragon enclosure with a black polythene sheet(kinda tarpolin) and was checking this is ok? did have newspaper but crickets were getting under it and hiding what other substrates could i use? or will it be fine just as it is?thanks chris

best bet would be to line the entire thing with fablon.
If you do a good job you never need to worrie about the water

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Mines is lined with tiles that I got out of the pound shop they are self adhesive and you just cut them to size .I have lined all my vivs with tese and they are great