I find it quite frustrating that, with the exception of very small nano tanks, lids seem to be completely absent. I looked at the Red Sea Reefer 170, and it's a completely open system. Everyone, including those who design products for Red Sea, knows that fish and shrimp can, and very likely will at some point, jump. Given the prices of fish and even shrimp today, it's not something I want to risk. It's baffling that I have to pay a premium for an aquarium package, only to then have to spend even more on a customised lid. Whether it’s from specialists who can quickly charge over $100 (though they do look very good, I must admit), or from some uninspired offerings from the manufacturers, it's simply unacceptable. Yes, I know I can make one myself, but it shouldn't be necessary.