A breeding cave for the big ones. The Cone is our widest, largest tube — a roomier bore for broad-bodied and fully mature plecos that simply don't fit, or won't settle, in a standard cave. Give a large fish a shelter sized to its body and it's far more likely to claim it, hold it, and spawn in it. Inside, the job is the same as any good breeding tube: the male backs in, blocks the entrance, and guards the eggs with a steady flow of water passing over them — just on a scale that suits a large adult. Which fish it's for Large, mature Hypancistrus and broad-bodied plecos Bigger Pseudacanthicus (cactus plecos) and similar species Full-grown bristlenose and other plecos that have outgrown a standard tube How to use Rinse before use. Place on the substrate, slightly buried if needed for stability, in a low-flow, shaded area. Details Dimensions: 17.8 × 10 × 7.5 cm (7.0 × 3.97 × 2.97 in) Material: high-temperature fired clay Available in color options Safety Inert, non-toxic ceramic. Safe for freshwater aquariums, including fish, shrimp, and other invertebrates. Tested daily on the Plecoceramics farm.