Agelas conifera, the Brown Tube Sponge is typically smooth walled and brown to tan in color. They grow in clusters. These sponges come in a range of sizes from minuscule encrusting species under rocks to massive sponges which can be up to one and half meters high. They are able to filter many liters of sea water every few seconds. Sponges can exude highly toxic chemicals and so have very few predators apart from nudibranchs, sea stars, sea urchins and umbrella shells. Their color can vary if growing in the light or when growing in the shade. They are found on protected coral and reefs in canyons and crevices along the ocean floor. They feed on plankton primarily and mostly live near the Caribbean.