Intensity can also be considered as the brightness or dullness of a color. Intensity is adjusted by adding additional colors to the pure hue. A color can be made less intense by adding gray to the color. In some ways, intensity can be measured by the amount of gray in the hue.
Making the world better, one answer at a time. The rocks in a drum fish head are a sort of over developed hearing aid. They are called otoliths, and are actually a bone formation, and are similar to the inside of oyster shells or freshwater muscles. Both freshwater and saltwater varieties of the drum have these, and were used in olden times as jewelry or good luck charms.
Live rock is generally a piece of reef rock (ancient dead corals) that is pulled directly from wild reefs or culture facilities. It is then boxed and immediately shipped to your local fish store or a distributor. Live rock provides structure for aquascaping and biological filtration in your aquarium. More often than not, live rock rock is still moist from being shipped right after it is collected. The reason for such quick shipment is to avoid the die off of beneficial bacteria and organisms that use the live rock as a host.