Yes mesh is replaceable and you can order them in sections as well as one large one, must say I am very pleased with this purchaseThe mesh is replaceable on those, right? They have a groove like the old metal screen mesh lids? I think these will look good on my EuroBraced tank. I was going to go with another acrylic top maker, but I think I like these a little better. The other ones offer hinged access doors though. I do like that feature on my nano lid.