For a specific size or for small aquariums. Two types of scissors for different aquarium needs. The aquavitro surgical stainless steel spring shears are ideal for regular aquatic plant maintenance, especially when trimming smaller leaves and stems such as aquarium grass soil. These are especially useful for small and nano aquariums where larger tools are difficult to use and handle. Spring shears are ideal for quick and accurate cutting of leaves and stems. In marine and reef aquariums, they work great for easily trimming corals, especially for cuttings.