Cobalt Aquatics Pleco Caves. Pleco caves are the perfect hiding and spawning site for plecos and catfish. Great for plecos, including bristlenose. Handmade with natural stoneware clays and fired to 2200+ degrees. Will not leach chemicals or color into the water, and will not breakdown over time. Triple checked for impeccable quality. Available in: Small - 1 1/2" diameter x 6-7" long Large - 2 3/4" diameter x 9-10" long