Like Admiral Ackbar would say, ""It"s a trap"" - but in a good way with the Marina Net Trap (Fine Mesh). The fine mesh netting lets water flow through easily, while isolating weak or sick fish. It"s the perfect solution for safely keeping pregnant livebearers separate and keeps oxygen levels up so your fish will be healthy. About Marina Dedicated to providing a wide variety of friendly and affordable aquarium products for all types of fish keeping, Marina’s extensive product line has something for every fish hobbyist. Newbies love the ease and convenience of Marina’s fish starter kits, and those with experience appreciate the reliable efficiency of their filters and heaters. A varied selection of colorful, creative decorations such as gravel, plants, and ornaments, provide a gorgeous underwater environment. A vast array of maintenance and breeding accessories are practical, reliable, and timesaving so you can spend more time enjoying your aquarium and less time cleaning it. * Made of fine mesh * Floating safety chamber for pregnant live-bearer * Ideal isolation chamber for sick or weak fish * Netting allows free flow of water and keeps oxygen level up * Dimensions: 5L x 6W x 5H inches