So I bought a really nice healthy Diamond goby and after one night he did a great job on the sand. But decided to jump out of the tank, oddly enough this is the second time this has happened in a row. Not having much luck so far with the gobies because they keep killing themselves! I need to have something to cover my reef tank. Any ideas??? The metal halide lights are within 5" of the top so it needs to be able to withstand heat? Metal Screen?